Blade assembly for a lawn mower

ABSTRACT

A lawn mower includes a blade assembly configured to perform a cutting function, a deck formed with an accommodation space for accommodating at least a portion of the blade assembly, a motor configured to drive the blade assembly to rotate about a rotation axis, and a battery pack configured to power the motor. The blade assembly includes a first cutting portion configured to cut grass and a second cutting portion configured to cut grass. In the direction parallel to the rotation axis, the second cutting portion is located below the first cutting portion. The battery pack includes a battery pack housing and battery cells provided in the battery pack housing.

RELATED APPLICATION INFORMATION

The present application is a continuation of International ApplicationNumber PCT/CN2019/107650, filed on Sep. 25, 2019, through which thisapplication also claims the benefit of Chinese Patent Application No.201821584956.0, filed on Sep. 27, 2018, Chinese Patent Application No.201821889111.2, filed on Nov. 15, 2018, Chinese Patent Application No.201920533524.5, filed on Apr. 18, 2019, Chinese Patent Application No.201910312144.3, filed on Apr. 18, 2019, Chinese Patent Application No.201910576318.7, filed on Jun. 28, 2019, and Chinese Patent ApplicationNo. 201921545742.7, filed on Sep. 17, 2019, each of which isincorporated herein by reference in its entirety.

BACKGROUND

As a basic operation of lawn trimming, mowing requires the use of simpleand efficient mowing machinery to complete the mowing task withguaranteed quality and quantity. Lawn mowers have been widely used inthe trimming of various kinds of lawns. As the functional element of thelawn mower, the structural design of the blade greatly affects thecutting performance of the lawn mower.

Lawn mowers can be divided into engine-driven and motor-driven by energysource. Among them, the motor-driven lawn mower generally uses batterypacks as an energy source, which has the advantages of less noise andpollution. However, considering the load problem, the motor-driven lawnmower in the related art has an unreasonable blade structure, whichresults in a large load on the motor and a low cutting efficiency.

SUMMARY

The present application provides a lawn mower with a smaller motor loadand higher cutting efficiency.

An example provides a lawn mower, including: a blade assembly configuredto perform a cutting function; a deck formed with an accommodation spacefor accommodating at least a portion of the blade assembly; a motorconfigured to drive the blade assembly to rotate about a rotation axis;and a battery pack configured to provide power source for the motor. Theblade assembly includes: a first cutting portion configured to cutgrass; and a second cutting portion configured to cut grass; wherein inthe direction parallel to the rotation axis, the second cutting portionis located below the first cutting portion. The battery pack includes abattery pack housing and battery cells provided in the battery packhousing. The maximum length of a line connecting any two points of theprojection of the blade assembly in a plane perpendicular to therotation axis and the projection of the rotation axis in the plane isthe rotation diameter of the blade assembly. The product of the rotationdiameter D (mm), the number N of battery cells included in the batterypack, and the mass M (g) of the blade assembly is greater than or equalto 3.5×10⁵ (mm·g) and less than or equal to 7.3×10⁷ (mm·g).

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of a lawn mower provided as Example 1;

FIG. 2 is a plan view of a partial structure of the lawn mower of FIG.1;

FIG. 3 is a perspective view of a partial structure of the lawn mower ofFIG. 1;

FIG. 4 is a plan view of a partial structure of a blade assembly of thelawn mower of FIG. 1;

FIG. 5 is a cross-sectional view of a partial structure of the lawnmower of FIG. 1, wherein a mounting assembly is in a first mountingstate;

FIG. 6 is an exploded view of a partial structure of the lawn mower ofFIG. 1;

FIG. 7 is a schematic view of a partial structure of the lawn mowerprovided in Example 1, wherein the mounting assembly is in a secondmounting state;

FIG. 8 is a schematic diagram of a partial structure of the lawn mowerprovided in Example 1, wherein the mounting assembly is in the secondmounting state;

FIG. 9 is an exploded view of a blade assembly of the lawn mower of FIG.1;

FIG. 10 is a schematic diagram of a first blade and a second blade ofthe lawn mower of FIG. 1;

FIG. 11 is a schematic diagram of a partial structure of a lawn mowerprovided in Example 2;

FIG. 12 is a schematic diagram of a blade assembly and a connectingassembly of a lawn mower provided in Example 3;

FIG. 13 is a schematic diagram of a blade assembly of a lawn mowerprovided in Example 4;

FIG. 14 is a plan view of the blade assembly in FIG. 13;

FIG. 15 is a plan view of a second blade of the blade assembly in FIG.13;

FIG. 16 is a plan view from another angle of the second blade of theblade assembly in FIG. 13;

FIG. 17 is a schematic diagram of a partial structure of a lawn mowerprovided in Example 5;

FIG. 18 is a cross-sectional view of the structure in FIG. 17;

FIG. 19 is an exploded view of the partial structure of the lawn mowerof FIG. 17;

FIG. 20 is a schematic diagram of a partial structure of a lawn mowerprovided in Example 6;

FIG. 21 is a plan view of a blade assembly and a mounting assembly ofthe lawn mower provided in Example 6;

FIG. 22 is an exploded view of the partial structure of the lawn mowerof FIG. 20;

FIG. 23 is a schematic diagram of a partial structure of a lawn mowerprovided in Example 7;

FIG. 24 is a cross-sectional view of the structure in FIG. 23;

FIG. 25 is an exploded view of the structure in FIG. 23;

FIG. 26 is a schematic diagram of a partial structure of a lawn mowerprovided in Example 8;

FIG. 27 is a schematic diagram of a lawn mower connected with a grasspressing assembly provided in Example 9;

FIG. 28 is a perspective view of the grass pressing assembly in FIG. 27;

FIG. 29 is a plan view of the grass pressing assembly in FIG. 27;

FIG. 30 is a cross-sectional view of the grass pressing assembly in FIG.27;

FIG. 31 is a schematic diagram of a grass pressing assembly connected toa lawn mower provided in Example 10;

FIG. 32 is a perspective view of a lawn mower provided in Example 11;

FIG. 33 is a bottom view of the lawn mower of FIG. 32;

FIG. 34 is a circuit diagram of the lawn mower of FIG. 32;

FIG. 35 is a schematic diagram of the connection of a first signal lineof the lawn mower of FIG. 32 to a first output circuit board and asecond output circuit board;

FIG. 36 is a circuit diagram of a lawn mower provided in Example 12;

FIG. 37 is a schematic diagram of a partial structure of the lawn mowerof FIG. 32;

FIG. 38 is a perspective view of a deck in the lawn mower of FIG. 32;

FIG. 39 is a plan view of the deck in FIG. 38;

FIG. 40 is a cross-sectional view of the deck in FIG. 39 along line V-V;

FIG. 41 is a perspective view of the deck of FIG. 38 when connected to aplug;

FIG. 42 is a schematic diagram of a lawn mower provided in Example 13;

FIG. 43 is a perspective view of the lawn mower of FIG. 42;

FIG. 44 is a plan view of a blade assembly of the lawn mower of FIG. 42;

FIG. 45 is an exploded view of the blade assembly in FIG. 44;

FIG. 46 is a plan view of a partial structure of the blade assembly inFIG. 45;

FIG. 47 is a schematic diagram of a lawn mower provided in Example 14;

FIG. 48 is a perspective view of a blade assembly of the lawn mower ofFIG. 47;

FIG. 49 is a plan view of a blade of the blade assembly of FIG. 48;

FIG. 50 is a cross-sectional view of the blade in FIG. 49;

FIG. 51 is a schematic diagram of a blade assembly of a lawn mowerprovided in Example 15;

FIG. 52 is a plan view of a blade of the blade assembly of FIG. 51.

DETAILED DESCRIPTION Example 1

FIG. 1 is a schematic diagram of a lawn mower 100 provided in Example 1of the present application. Depending on the operation mode of the user,the lawn mower 100 in the present application may be either a hand-pushlawn mower or a riding lawn mower. This example uses a hand-push lawnmower driven by a motor as an example for description. All “assembly” inthis application refer to a combination including at least one componentor part, which realizes a specific function through interaction orcoordination. For the convenience of explaining the technical solutionof the present application, the up-down direction is defined as shown inFIG. 1.

As shown in FIGS. 1-3, the lawn mower 100 includes a blade assembly 11,a deck 12, a motor 13, and a battery pack. The blade assembly 11 isconfigured to perform the cutting function of the lawn mower 100; thedeck 12 is formed with an accommodation space for accommodating at leastpart of the blade assembly 11; in this example, the blade assembly 11 islocated inside the accommodation space; the motor 13 drives the bladeassembly 11 to rotate about the rotation axis 100′, and the motor 13 islocated above the deck 12 and forms a coaxial rotation with the bladeassembly 11 about the rotation axis 100′. In an example, the motor 13includes a motor shaft, and the lawn mower 100 further includes a driveshaft 14 that drives the blade assembly 11 to rotate. The drive shaft 14may be a motor shaft, and a transmission mechanism may be providedbetween the motor 13 and the blade assembly 11 so that the motor 13 andthe drive shaft 14 form a non-coaxial rotation. The battery packprovides a power source for the motor 13. The lawn mower 100 alsoincludes a fan 15 connected to the drive shaft 14; the fan 15 rotatesabout an axis that is parallel or coincident with the rotation axis100′.

When the motor 13 is started to drive the blade assembly 11 to rotateabout the rotation axis 100′ and the tip linear velocity of the bladeassembly 11 is greater than or equal to 40 m/s and less than or equal to100 m/s, the working time of the lawn mower 100 with 100 WH energyconsumption of the battery pack is defined as the hectowatt-hour batterylife of the lawn mower 100, and the hectowatt-hour battery life of thelawn mower 100 is greater than or equal 4 min and less than or equal to30 min; in one example, the hectowatt-hour battery life of the lawnmower 100 is greater than or equal to 5 min and less than or equal to 20min; in other examples, the hectowatt-hour battery life of the lawnmower 100 is greater than or equal to 6 min and less than or equal to 15min. In this example, the hectowatt-hour battery life of the lawn mower100 is about 12 min. Since the lawn mower 100 of the present example hasthe blade assembly 100 with better structure design, smaller load andhigher cutting efficiency, during operation the lawn mower 100 has ahectowatt-hour battery life in the above range, such that the lawn mower100 has a good cutting performance. The battery pack here only refers tothe battery pack that supplies power to the motor 13 to drive the bladeassembly 11 to rotate.

In addition, when the motor 13 drives the blade assembly 11 to rotateabout the rotation axis 100′ at no load, the working time of the lawnmower 100 with 100 WH energy consumption of the battery pack is definedas the no-load battery life of the lawn mower 100, and the no-loadbattery life of the lawn mower 100 is greater than or equal to 9 min andless than or equal to 35 min; in one example, the no-load battery lifeof the lawn mower 100 is greater than or equal to 12 min and less thanor equal to 33 is min; in other examples, the no-load battery life ofthe lawn mower 100 is greater than or equal to 18 min and less than orequal to 30 min. In this example, the no-load battery life of the lawnmower 100 is about 22 min. Since the lawn mower 100 of the presentexample has the blade assembly with better structure design, smallerload and higher cutting efficiency, as well as reasonable no-loadcondition settings, during operation the lawn mower 100 has a no-loadbattery life in the above range, such that the lawn mower 100 has a goodcutting performance.

As shown in FIGS. 2-5, the blade assembly 11 includes a first blade 111and a second blade 112, and the first blade 111 and the second blade 112are respectively formed with a first cutting portion 111 a and a secondcutting portion 112 a that are configured to cut grass. When theentirety constructed by the first blade 111 and second blade 112 rotateabout the rotation axis 100′, the first cutting portion 111 a and thesecond cutting portion 112 a performs mowing. In this example, thecutting portions refer to a structure having a cutting function to cutvegetation; the cutting portion may be a common cutting portion or acutting structure different from the cutting portion. A cutting portionrefers to an integrally formed or continuous structure.

In a direction parallel to the rotation axis 100′, the second cuttingportion 112 a is located below, but not limited to directly under, thefirst cutting portion 111 a; or the second cutting portion 112 a and thefirst cutting portion 111 a are at least partially within the sameplane. In this example, the first blade 111 and the second blade 112 aretwo blades formed separately. The first blade 111 is located above thesecond blade 112 relative to the ground in a direction parallel to therotation axis 100′. The first blade 111 and the second blade 112 rotatesynchronously. As shown by the arrows in FIG. 2, the first blade 111 andthe second blade 112 rotate coaxially and synchronously along therotation direction A about the rotation axis 100′.

The lawn mower 100 also includes a control system configured to controlthe operation of the motor 13. When the lawn mower 100 has no load, thesum of the input power of the motor 13, the input power of the controlsystem, and the input power of the blade assembly 11 is the no-loadinput power of the lawn mower 100; the no-load input power is greaterthan or equal to 100 W and less than or equal to 380 W, in this example,the no-load input power is greater than or equal to 200 W and less thanor equal to 300 W.

In one example, no-load means that the blade assembly 11 of the lawnmower 100 rotates at a predetermined speed under atmospheric pressure,and the blade assembly 11 has no external load.

The volume of the smallest cylinder 11′ surrounding the first blade 111and the second blade 112 is defined as the sweep volume of the bladeassembly 11. When the blade assembly 11 rotate about the rotation axis100′, the first cutting portion 111 a and the second cutting portion 112a are both located in the space surrounded by the smallest cylinder 11′.As shown in FIG. 2, the rectangle indicated by the dotted line is a planview of the cylinder 11′ that surrounds the first blade 111 and thesecond blade 112 in this example. The sweep volume of the blade assembly11 is the volume of the cylinder 11′, and the volume of the cylinder 11′is about the volume of the cylinder 11′ with the rotation diameter D ofthe blade assembly 11 as the diameter (referring to FIG. 4), and themaximum height of the blade assembly 11 in the direction parallel orcoincident with the rotation axis 100′ as the height. The rotationdiameter D of the blade assembly 11 is the maximum length of the lineconnecting any two points of the projection of the blade assembly 11 ina plane perpendicular to the rotation axis 100′ and the projection ofthe rotation axis 100′ in the plane. In this example, since the firstblade 111 and the second blade 112 are both perpendicular to therotation axis 100′, and the first blade 111 and the second blade 112 arecoaxially mounted to the drive shaft 14; the first blade 111 is locateddirectly above the second blade 112. The sweep volume of the bladeassembly 11 is about the volume of the cylinder 11′ with the maximumdistance from any point on the blade assembly 11 to the rotation axis100′ as the radius, and the maximum sum of the heights of the firstblade 111 and the second blade 112 parallel to the rotation axis 100′ asthe height. In one example, the heights of the first blade 111 and thesecond blade 112 are respectively the maximum dimensions of the firstblade 111 and the second blade 112 in the direction parallel to therotation axis 100′ when the blade assembly 11 is mounted to the driveshaft 14.

In this example, the sweep volume of the blade assembly 11 is greaterthan or equal to 400 cm³ and less than or equal to 8000 cm³. When thesweep volume of the blade assembly 11 is kept within this range, thelawn mower 100 has a relatively small load, in other words, when thesweep volume of the blade assembly 11 is kept within this range, thelawn mower 100 has a relatively small load while the double bladesguarantee the cutting performance of the lawn mower 100, therebyenabling the lawn mower 100 to have a high cutting efficiency. In thisexample, the sweep volume of the blade assembly 11 is greater than orequal to 600 cm³ and less than or equal to 6800 cm³. In one example, thesweep volume of the blade assembly 11 is greater than or equal to 1000cm³ and less than or equal to 5000 cm³.

The structure of the blade assembly is not limited to the structure inthis example. In an example, the blade assembly may include only oneblade; both the first cutting portion and the second cutting portion areprovided on the blade. In the direction of the rotation axis, the secondcutting portion is located below, but not limited to directly below, thefirst cutting portion; the first cutting portion and the second cuttingportion may be integrally formed or connected with other structures toform a complete blade. For example, the blade assembly may include ablade body, and the first cutting portion and the second cutting portionare respectively disposed on a plurality of fins extending from theblade body, and the plurality of fins and the blade body may be fixedlyconnected or integrally formed or detachably connected.

As shown in FIG. 4, the phase angle α formed by the first cuttingportion 111 a and the second cutting portion 112 a is greater than orequal to 0 and less than 90 degrees. The phase angle α is the anglebetween the straight lines on which the projections of the blade edge111 b of the first cutting portion 111 a and the blade edge 112 b of thesecond cutting portion 112 a in a plane perpendicular to the rotationaxis 100′ are located. The edge 111 b of the first cutting portion 111 ais the front most side of the first cutting portion 111 a, that is, theside that first contacts the vegetation when the first blade 111 rotatesin the rotation direction A about the rotation axis 100′; Likewise, theedge of the second cutting portion 112 a is the front most side of thesecond cutting portion 112 a, that is, the side that first contacts thevegetation when the second blade 112 rotates in the rotation direction Aabout the rotation axis 100′. When the phase angle of the first cuttingportion 111 a and the second cutting portion 112 a is within the aboverange, the first cutting portion 111 a and the second cutting portion112 a as a whole have higher cutting efficiency. In an example, thephase angle α formed by the first cutting portion 111 a and the secondcutting portion 112 a is greater than or equal to 10 degrees and lessthan or equal to 60 degrees. In this example, the phase angle α betweenthe first cutting portion 111 a and the second cutting portion 112 a isabout 20 degrees.

The first blade 111 includes at least one first cutting portion 111 a,and the first cutting portion 111 a may be regarded as a continuouscutting portion formed on the first blade 111. In an example, the firstblade 111 and the second blade 112 respectively include at least twofirst cutting portions 111 a and at least two second cutting portions112 a. In this example, the first blade 111 is formed with two firstcutting portion 111 a, the two first cutting portions 111 a arerespectively provided on two ends of the first blade 111, and are bothdisposed on the front side of the rotation direction A, that is, theside that first contacts the vegetation when the first blade 111 rotatesin the rotation direction A about the rotation axis 100′; the two firstcutting portions 111 a are center symmetrical about the rotation axis100′. Similarly, the second blade 112 also includes at least one secondcutting portion 112 a, in the present example the second blade 112 isformed with two second cutting portions 112 a, the two second cuttingportions 112 a are respectively provided on two ends of the second blade112, and are both located on the front side of the rotation direction A,that is, the side that first contacts the vegetation when the secondblade 112 rotates in the rotation direction A about the rotation axis100′; the two second cutting portions 112 a are center symmetrical aboutthe rotation axis 100′.

The sum of the number of the first cutting portions 111 a formed by thefirst blade 111 and the number (unit: piece) of the second cuttingportions 112 a formed by the second blade 112 is defined as the numberof cutting portions of the blade assembly 11. In the blade assembly 11of the present example, the ratio of the sweep volume to the number ofcutting portions of the blade assembly 11 is greater than or equal to 50cm³ and less than or equal to 4000 cm³. In one example, the ratio of thesweep volume to the number of cutting portions of the blade assembly 11is greater than or equal to 75 cm³ and less than or equal to 3400 cm³.In one example, structurally discontinuous first cutting portions 111 aare regarded as a plurality of different first cutting portions 111 a,and the number of first cutting portions 111 a is the number ofdiscontinuous first cutting portions 111 a provided on the first blade111; similarly, structurally discontinuous second cutting portions 112 aare regarded as a plurality of different second cutting portions 112 a,and the number of second cutting portions 112 a is the number ofdiscontinuous second cutting portions 112 a provided on the second blade112. In this example, the ratio of the sweep volume to the number ofcutting portions of the blade assembly 11 is about 1700 cm³. The greaterthe number of cutting portions, the better the cutting performance ofthe lawn mower 100, but the greater the number of cutting portions, thegreater the sweep volume requirement of the blade assembly 11, as wellas the load of the lawn mower 100. In this example, by optimizing thestructure of the blade assembly 11, the ratio of the sweep volume to thenumber of cutting portions of the blade assembly 11 is kept within theabove-mentioned optimal range, thereby ensuring that the lawnmower 100maintains an optimal cutting performance under a small load.

As shown in FIG. 5, the lawn mower 100 further includes a mountingassembly 16, the mounting assembly 16 has a first mounting state inwhich the blade assembly 11 is mounted to the drive shaft 14 so that theblade assembly 11 rotates with the drive shaft 14 and a second mountingstate in which one of the first blade 111 and the second blade 112 isremoved and only the other one of the first cutting portion 111 a andthe second cutting portion 112 a is mounted to perform the cuttingfunction.

In this example, as shown in FIGS. 5-8, since the first cutting portion111 a and the second cutting portion 112 a are respectively provided onthe separately formed first blade 111 and second blade 112, therefore,the mounting assembly 16 has a first mounting state in which the bladeassembly 11 is mounted to the drive shaft 14 so that the blade assembly11 rotates with the drive shaft 14 and a second mounting state in whichone of the first blade 111 and the second blade 112 is removed and onlythe other one of the first blade 111 and the second blade 112 is mountedto perform the cutting function. That is to say, the mounting assembly16 can mount the blade assembly 11 including the first blade 111 and thesecond blade 112 to the drive shaft 14 in the first mounting state, andcan also mount the blade assembly 11 including only one of the firstblade 111 and the second blade 112 to the drive shaft 14 in the secondmounting state. Considering the diversity of usage conditions, themounting assembly 16 in this example has multiple mounting states toprovide better adaptability, allowing the user to reduce or increase thenumber of blades based on their specific needs without having to replacethe entire mounting assembly 16 and blade assembly 11, thereby enhancingmowing practicability.

In an example, the mounting assembly 16 has a first mounting state inwhich a first type of blade assembly including the first cutting portionand the second cutting portion is mounted to the drive shaft, and themounting assembly also has a second mounting state in which the firsttype of blade assembly is removed and a second type of blade assemblyincluding only one cutting portion is mounted to the drive shaft. Basedon the structure that the first cutting portion and the second cuttingportion are respectively provided on the first blade and the secondblade, that is to say, the mounting assembly has a first mounting statein which a first type of blade assembly including the first blade andthe second blade is mounted to the drive shaft. The mounting assemblyalso has a second mounting state in which the first type of bladeassembly is removed and a second type of blade assembly including onlyone blade is mounted to the drive shaft. In other words, the mountingassembly 16 can not only independently install one or both of the firstblade and the second blade, but also independently install other bladesthat do not belong to the first blade and the second blade.

In an example, the lawn mower includes a first type of blade assemblythat performs the cutting function. The first type of blade assemblyincludes a first blade, and the first blade is formed with a firstcutting portion that is configured to cut grass. The mounting assemblyhas a first mounting state in which the first type of blade assembly ismounted to the drive shaft so that the blade assembly rotates with thedrive shaft; the mounting assembly also has a second type in which thefirst type of blade assembly is removed and a second type of bladeassembly including two cutting portions is mounted to the drive shaft toperform the cutting function; wherein, the two cutting portions of thesecond type of blade assembly are respectively located on the upper andlower sides in the direction of the rotation axis. That is to say, themounting assembly causes the lawn mower to switch from the first type ofblade assembly with one cutting portion to the second type of bladeassembly with two cutting portions; the two cutting portions arerespectively located on the upper and lower sides in the direction ofthe rotation axis. In an example, the second type of blade assembly mayinclude the first cutting portion of the first type of blade assembly,or may not include the first cutting portion of the first type of bladeassembly but is otherwise formed second type of blade assembly totallydifferent from the first type of blade assembly. If the second type ofblade assembly includes the first cutting portion of the first type ofblade assembly, the position of the first cutting portion relative tothe drive shaft may be the same or may be changed. For example, thefirst type of blade assembly includes the first blade provided with thefirst cutting portion, the second type of blade assembly adds a secondblade provided with a second cutting portion in addition to the firsttype of blade assembly, and the second blade is mounted to the lowerside or the upper side of the first blade in the direction of therotation axis through the mounting assembly.

In an example, the lawn mower includes a blade assembly and a lawn mowerbody. The lawn mower body includes a deck, a motor, and a battery pack.The motor is mounted to the deck, and the battery pack supplies power tothe motor. The blade assembly includes a first type of blade assemblyand a second type of blade assembly, and the motor drives the first typeof blade assembly or the second type of blade assembly to rotate about arotation axis; the first type of blade assembly includes a first blade,and the first blade is formed with a first cutting portion for cuttinggrass; the second type of blade assembly includes a first blade and asecond blade, the first blade is formed with a first cutting portion forcutting grass; the second blade is formed with a second cutting portionfor cutting grass; wherein, in the direction of the rotation axis, thesecond cutting portion is located below the first cutting portion; thebody of the lawn mower can be adapted to the first type of bladeassembly or the second type of blade assembly. The body of the lawnmower can be adapted to mount the second type of blade assembly afterthe first type of blade assembly is removed, or can be adapted to mountthe first type of blade assembly when the second type of blade assemblyis removed.

The blade assembly 11 in the present example is driven by friction. Themounting assembly 16 includes a drive member 161; the drive member 161is configured to drive the blade assembly 11 to rotate about therotation axis 100′; the drive member 161 is connected to the drive shaft14 and is driven by the shaft 14 is, and the drive member 161 and theblade assembly 11 realize transmission through static friction. In oneexample, as shown in FIGS. 5-6, the drive member 161 is a flange, andthe flange and the drive shaft 14 form a fixed connection in the radialdirection, and the blade assembly 11 is in surface contact with theflange in a plane perpendicular to the rotation axis 100′. The mountingassembly 16 further includes a clamping assembly 162; the clampingassembly 162 is configured to push the blade assembly 11 along thedirection of the rotation axis 100′ to the surface of the drive member161; the clamping assembly 162 is mounted to the drive shaft 14 andforms a fixed and detachable connection with the drive shaft 14 in thedirection along the rotation axis 100′. In an example, the drive shaft14 and the flange form a flat fit, and the clamping assembly 162includes a bolt 162 a and a first washer 162 b. The flange, the bladeassembly 11, the first washer 162 b, and the bolt 162 a form a close fitfrom top to bottom along the rotation axis 100′, wherein the flange, theblade assembly 11, and the first washer 162 b embrace around the driveshaft 14, while the bolt 162 a is inserted into the drive shaft 14 andforms a screw connection with the drive shaft 14.

As shown in FIG. 5, when the mounting assembly 16 is in the firstmounting state, the bottom surface of the drive member 161 is in closecontact with the upper surface of the blade assembly 11. The firstwasher 162 b and the drive shaft 14 also form a flat fit.

As shown in FIGS. 7-8, the mounting assembly 16 is in the secondmounting state. In FIG. 7, only the first blade 111 is mounted to thedrive shaft 14 through the mounting assembly 16. In this example, asecond washer 162 c is added to fix the position of the first blade 111relative to the drive shaft 14 along the direction of the rotation axis100′. As shown in FIG. 8, the mounting assembly 16 also includes a fan15; the fan 15 is fixedly connected to the drive member 161 and embracesaround the outside of the drive member 16, forming a coaxial connectionwith the drive member 161. The fan 15 is driven by the drive member 161,and the drive member 161 is formed with a drive portion 161 a (as shownin FIG. 5) for driving the fan 15, the drive portion 161 a protrudesfrom the drive member 161 in the radial direction, and the fan 15 has agroove to tightly engage with the drive portion 161 a. In the directionof the rotation axis 100′, the lower surface of the fan 15 is locatedbelow the lower surface of the drive member 161. When only the firstblade 111 or the second blade 112 is mounted to the drive shaft 14, thefan 15 makes surface contact with the blade assembly 11, the lowersurface of the fan 15 pushes against the upper surface of the bladeassembly 11, and the fan 15 and the blade assembly 11 form a frictiondrive. In an example, the connection between the mounting assembly 16and the blade assembly 11 can adopt both connection methods in the abovetwo examples at the same time, that is, the mounting assembly 16 pressesthe first blade 111 or the second blade 112 through the clampingassembly 162, and the clamping assembly 162 includes the fan 15 and thesecond washer 162 c.

In an example, the structure of the mounting assembly 16 and theconnection method between the mounting assembly 16 and blade assembly 11are not limited to the above examples, e.g., when the mounting assembly16 is in the second mounting state, replace the first washer 162 b witha second washer 162 c that is thicker than the first washer 162 b.Simple adjustments or replacements made on the basis of the mountingassembly 16 of the present application for switching the mounting stateshould be considered within the scope of protection of the presentapplication. The mounting assembly 16 may include a plurality of part orcomponents; the mounting assembly 16 may include different sets of partsor components when the mounting assembly 16 is in the first mountingstate and the second mounting state, respectively.

The drive member 161 and the blade assembly 11 make surface contact in aplane perpendicular to the rotation axis 100′; the contact area of thedrive member 161 and the blade assembly 11 is greater than or equal to100 mm² and less than or equal to 1000 mm². In an example, the contactarea of the drive member 161 and the blade assembly 11 is greater thanor equal to 300 mm² and less than or equal to 500 mm². In this example,the contact area between the flange and the blade assembly 11 isapproximately 432 mm², and the contact area between the lower surface ofthe flange and the upper surface of the blade assembly 11 isapproximately 432 mm². Correspondingly, when the mounting assembly 16 isin the second mounting state and the fan 15 and the blade assembly 11form a friction drive, the fan 15 and the blade assembly 11 make surfacecontact in a plane perpendicular to the rotation axis 100′; the contactarea between the fan 15 and the blade assembly 11 is greater than orequal to 100 mm² and less than or equal to 1000 mm².

As shown in FIGS. 4-6 and FIG. 9, the blade assembly 11 is formed withat least one mounting hole 113 that engages with the drive shaft 14. Inthis example, when the blade assembly 11 forms an integral unit thatmoves together, the blade assembly 11 only has a mounting hole 113 thatengages with the drive shaft 14 to facilitate user installation. Themounting hole 113 is located approximately at the center of the bladeassembly 11, and the blade assembly 11 is center symmetrical about thecenter of the mounting hole 113, making the blade assembly 11 morestable when rotating about the rotation axis 100′, and avoiding thegeneration of eccentric torques. In an example, the first blade 111 andthe second blade 112 are respectively formed with a first mounting hole113 a and a second mounting hole 113 b. When the blade assembly 11 ismounted to the drive shaft 14, the first mounting hole 113 a and thesecond mounting holes 113 b overlap in the up-down direction along therotation axis 100′. In an example, the blade assembly 11 may be formedwith a plurality of mounting holes 113, and the mounting assembly 16includes a plurality of connecting shafts that engage with the mountingholes 113 accordingly, and the connecting shafts are connected to thedrive shaft 14.

As shown in FIG. 5, the mounting assembly 16 is in contact with theblade assembly 11 to form at least one mounting surface 16 a that issubstantially perpendicular to the rotation axis 100′; the bladeassembly 11 is formed with at least one cutting surface 11 a that isperpendicular to the rotation axis 100′; at least one mounting surface16 a is located above the cutting surface 11 a in the direction of therotation axis 100′. In this example, the flange of the mounting assembly16 or the fan 15 and the first washer 162 b make surface contact withthe blade assembly 11 and form two mounting surfaces 16 a perpendicularto the rotation axis 100′. When the blade assembly 11 includes the firstblade 111 or the second blade 112, the first blade 111 or the secondblade 112 rotates about the rotation axis 100′ to form a cutting surface11 a, the plane where the cutting surface 11 a is located is the planewhere the edge 111 b of the first cutting portion 111 a or the edge 112b of the second cutting portion 112 a is located. When the bladeassembly 11 includes the first blade 111 and the second blade 112, thefirst blade 111 and the second blade 112 rotate about the rotation axis100′ to form two parallel upper and lower cutting surfaces 11 a, and theplane where the two upper and lower cutting surfaces 11 a are locatedare the planes where the edge 111 b of the first cutting portion 111 aand the edge 112 b of the second cutting portion 112 a are respectivelylocated. In this example, one mounting surface 16 a is located above thetwo cutting surfaces 11 a along the direction of the rotation axis 100′to avoid installing the mounting assembly 16 below the cutting surface11 a. In this example, the drive member 161 that drives the bladeassembly 11 to rotate is located above the cutting surface 11 a.

As shown in FIG. 9, the blade assembly 11 further includes a connectingassembly 114. The connecting assembly 114 connects the second blade 112to the first blade 111 so that the blade assembly 11 forms a unit thatcan move together when not mounted to the drive shaft 14. After theconnecting assembly 114 connects the second blade 112 to the first blade111, the second cutting portion 112 a and the first cutting portion 111a are located at different axial positions along the rotation axis 100′.That is to say, when the first blade 111 and the second blade 112 arenot integrally formed, the first blade 111 and the second blade 112 areconnected as a whole through the connecting assembly 114, and when notmounted to the drive shaft 14, the first blade 111 and the second blade112 may be fixedly connected or movably connected, that is, the firstblade 111 may move relative to the second blade 112. When the bladeassembly 11 is mounted to the drive shaft 14 and performs cutting as awhole, the first blade 111 is fixed relative to the second blade 112. Atthe same time, the connecting assembly 114 determines the relativeposition of the first cutting portion 111 a and the second cuttingportion 112 a in the direction of the rotation axis 100′. In an example,the first cutting portion 111 a is located above the second cuttingportion 112 a. In this example, the first blade 111 is located above thesecond blade 112. The connecting assembly 114 enables the user todisassemble and assemble the blade assembly 11 for ease of operation,while at the same time, fixes the relative axial positions of the firstcutting portion 111 a and the second cutting portion 112 a to preventthe user from repositioning the two cutting portions axially duringassembly and installing the first blade 111 and the second blade 112reversely or incorrectly, which plays a foolproof role.

When the connecting assembly 114 connects the second blade 112 to thefirst blade 111, the second blade 112 is fixed within a predeterminedangle range relative to the first blade 111. In an example, thepredetermined angle range is greater than or equal to 0 degrees and lessthan or equal to 20 degrees. In this example, the predetermined anglerange is greater than or equal to 5 degrees and less than or equal to 10degrees. That is to say, the connecting assembly 114 connects the firstblade 111 and the second blade 112 so that the first blade 111 and thesecond blade 112 form a fixed connection or a movable connection in therotation axial direction, and when the first blade 111 and the secondblade 112 form a movable connection in the axial direction, the firstblade 111 can rotate relative to the second blade 112 with a rotationangle greater than or equal to 0 degrees and less than or equal to 10degrees. The first blade 111 and the second blade 112 form a detachableconnection through the connecting assembly 114 for ease of maintenanceor replacement of the blade assembly 11 later.

In this example, the connecting assembly 114 is a common fastener, suchas a bolt and a nut or a screw and a nut. The blade assembly 11 isformed with at least one positioning portion 115 connected to theconnecting assembly 114; the positioning portion 115 can define therange of the phase angle of the first blade 111 relative to the secondblade 112, and the connecting assembly 114 is mounted to the positioningportion 115. In this example, the positioning portion 115 is apositioning hole, and positioning holes are formed on both the firstblade 111 and the second blade 112. The number of positioning portions115 is not limited. In this example, the number of positioning portions115 is greater than or equal to two. In an example, the first blade 111is formed with two diamond holes symmetrical about the rotation axis100′, and the second blade 112 is formed with two round holessymmetrical about the rotation axis 100′, the diamond holes engage withthe diamond-shaped protrusions on the head of the bolts, the round holesengage with the studs of the bolts, and the bolts are locked with thenuts, so that the first blade 111 and the second blade 112 are fixedlyconnected with a fixed phase angle in the circumferential direction anda fixed relative position in the axial direction. In an example, thepositioning hole may also be square or waist or other shaped; theengagement manner between the positioning hole on the first blade 111and the positioning hole on the second blade 112 and the connectingassembly 114 is not limited herein.

The connecting assembly 114 includes an engaging portion 114 a thatengages with the positioning portion 115. In this example, thepositioning portion 115 is a positioning hole, the engaging portion 114a is a bolt, and is a screw of the bolt, which engage with thepositioning hole to form a shaft hole fit. The connecting assembly 114further includes an axial fixing portion that fixes the position of thefirst blade 111 relative to the second blade 112 in a direction parallelto the rotation axis 100′, and the axial fixing portion is a bolt andnut. In an example, the axial fixing portion may be a magnetic elementmounted to the first blade 111 and the second blade 112, and the axialposition of the first blade 111 relative to the second blade 112 isfixed by magnetic attraction. The specific structures of the engagingportion 114 a and the axial fixing portion are not limited to the above.

In an example, the engaging portion of the connecting assembly isprovided on a mounting member such as a fan or a flange, and forms afixed connection or is integrally formed with the mounting member suchas a fan and a flange. For example, a drive portion is formed at thelower end of the fan, and the drive portion is configured to mount andposition the blade assembly. In one example, the connecting assemblyfurther includes a clamping member that axially clamps the bladeassembly, and the clamping member is connected to the blade assembly andmakes surface contact with the blade assembly. In this case, the bladeassembly can form either a friction transmission or a mechanicalposition transmission such as a flat position transmission with thedrive shaft.

As shown in FIGS. 4, 5, and 10, the positioning portion 115 generallyhas a geometric center. The distance from the geometric center to therotation axis 100′ is the positioning radius r, and the positioningradius r is greater than or equal to 0 mm and less than or equal to 50mm. In one example, the positioning radius r of the positioning portion115 is greater than or equal to the radius of the drive shaft 14 andless than or equal to 50 mm; in this example, the positioning radius rof the positioning portion 115 is about 30 mm. When the positioningradius r of the positioning portion 115 is 0 mm, that is, the geometriccenter of the positioning portion 115 coincides with the rotation axis100′. In one example, a radial groove is formed on the drive shaft 14,and the groove can accommodate the positioning portion 115. Thepositioning portion 115 is provided outside the drive shaft 14, that is,the positioning radius r of the positioning portion 115 is greater thanor equal to the radius of the drive shaft 14. For a regularly shapedpositioning portion 115, the geometric center is uniquely determined;for an irregularly shaped positioning portion 115, a point at the centerof the positioning portion 115 may be roughly determined to be thegeometric center. In one example, the ratio of the rotation diameter Dof the blade assembly 11 to the positioning radius r of the positioningportion 115 is greater than or equal to 5 and less than or equal to 25.When the position of the positioning unit 115 is in the above range, thepositioning effect of the positioning unit 115 is better. The rotationdiameter D is greater than or equal to 200 mm and less than or equal to700 mm.

In an example, the positioning hole may be other positioning holes withincomplete positioning effects, such as oval holes. These positioningholes can restrict to a predetermined degree but cannot completelyrestrict the rotation of the first blade 111 relative to the secondblade 112, such that the blade assembly 11 has a predeterminedadjustment space when encountering obstacles, thereby enhancing theservice life of the blade assembly 11.

The maximum length of the line connecting any two points of theprojection of the first blade 111 in a plane perpendicular to therotation axis 100′ in the direction perpendicular to the rotationdiameter D1 of the first blade 111 is the width W1 of the first blade111. The ratio of the rotation diameter D1 of the first blade 111 to thewidth W1 of the first blade 111 is equal to or greater than 5 and lessthan or equal to 13. The maximum length of the line connecting any twopoints of the projection of the second blade 112 in a planeperpendicular to the rotation axis 100′ in the direction perpendicularto the rotation diameter D2 of the second blade 112 is the width W2 ofthe second blade 112. The ratio of the rotation diameter D2 of thesecond blade 112 to the width W2 of the second blade 112 is equal to orgreater than 5 and less than or equal to 13. In this example, therotation diameter D1 of the first blade 111 is approximately 511 mm, thewidth W1 of the first blade 111 is approximately 51 mm, and the rotationdiameter D2 of the second blade 112 is approximately equal to therotation diameter D1 of the first blade 111. The width W2 of the secondblade 112 is approximately equal to the width W1 of the first blade 111.

As shown in FIGS. 9 and 10, at least one reinforcement rib 116 isrespectively formed on the surfaces of the first blade 111 and thesecond blade 112. In this example, the first blade 111 and the secondblade 112 are respectively formed with two reinforcement ribs 116. Thetwo reinforcement ribs 116 on the surface of the first blade 111protrude upward and extend along the length of the first cutting portion111 a, and are symmetrical about the rotation axis 100′; the tworeinforcement ribs 116 on the surface of the second blade 112 protrudedownward and extend along the length of the second cutting portion 112a, and are symmetrical about the rotation axis 100′. The shape of thereinforcement rib 116 is a long stripe. The ratio of the rotationdiameter D1 of the first blade 111 to the length al of a singlereinforcement rib 116 is greater than or equal to 2.5 and less than orequal to 10; the ratio of the rotation diameter D1 of the first blade111 to the total length of the plurality of the reinforcement ribs 116is greater than or equal to 1.3 and less than or equal to 5; the ratioof the width W1 of the first blade 111 to the width b1 of a singlereinforcement rib 116 is greater than or equal to 2 and less than orequal to 5. Similarly, the ratio of the rotation diameter D2 of thesecond blade 112 to the length al of a single reinforcement rib 116 isgreater than or equal to 2.5 and less than or equal to 10; the ratio ofthe rotation diameter D2 of the second blade 112 to the total length ofthe plurality of the reinforcement ribs 116 is greater than or equal to1.3 and less than or equal to 5; the ratio of the width W2 of the secondblade 112 to the width b1 of a single reinforcement rib 116 is greaterthan or equal to 2 and less than or equal to 5. In one example, thelength al of the reinforcement rib 116 refers to the maximum dimensionof the projection of the reinforcement rib 116 in a plane perpendicularto the rotation axis 100′ in the extending direction of thereinforcement rib 116; the width b1 of the reinforcement rib 116 refersto the maximum dimension of the projection of the reinforcement rib 116in a plane perpendicular to the rotation axis 100′ in the directionperpendicular to the extending direction of the reinforcement rib 116.In the extending direction of the first blade 111 or the second blade112 and in the direction perpendicular to the extending direction of thefirst blade 111 or the second blade 112, the reinforcement ribs 116 aredistributed in the middle of the first blade 111 and the second blade112 to improve the strength of the first blade 111 or the second blade112. In other examples, the number, position, and specific shape of thereinforcement rib 116 are not limited thereto.

In this example, the first blade 111 substantially extends along thedirection of the first straight line; the second blade 112 substantiallyextends along the direction of the first curve. Since the first blade111 is disposed above the second blade 112 in the direction of therotation axis 100′, and at the same time the first curve is at leastpartially curved downward, a sufficient accommodation space is formedbetween the first blade 111 and the second blade 112. In an example, thefirst blade 111 extends substantially in the direction of the secondcurve; the second blade 112 extends substantially in the direction ofthe third curve, that is, the first blade 111 and the second blade 112extend along the curve respectively. The second curve and the thirdcurve are two different curves differing in at least part of theircurvatures, so that a sufficient accommodation space is formed betweenthe first blade 111 and the second blade 112.

The length of the projection of the first cutting portion 111 a in aplane perpendicular to the rotation axis 100′ is greater than or equalto 10 mm and less than or equal to 600 mm; the length of the projectionof the second cutting portion 112 a in a plane perpendicular to therotation axis 100′ is greater than or equal to 10 mm and less than orequal to 600 mm. In an example, the length of the projection of thefirst cutting portion 111 a in a plane perpendicular to the rotationaxis 100′ refers to the length of the projection of the edge 111 b ofthe first cutting portion 111 a in a plane perpendicular to the rotationaxis 100′. When the first blade 111 includes a plurality of the firstcutting portions 111 a, the length of the projection of the firstcutting portion 111 a in a plane perpendicular to the rotation axis 100′is the sum of the length of the projection of the edges 111 b of theplurality of the first cutting portions 111 a in a plane perpendicularto the axis 100′. Similarly, the length of the projection of the secondcutting portion 112 a in a plane perpendicular to the rotation axis 100′refers to the length of the projection of the edge 112 b of the secondcutting portion 112 a in a plane perpendicular to the rotation axis100′. When the second blade 112 includes a plurality of the secondcutting portions 112 a, the length of the projection of the secondcutting portion 112 a in a plane perpendicular to the rotation axis 100′is the sum of the length of the projection of the edges 112 b of theplurality of the second cutting portions 1112 a in a plane perpendicularto the rotation axis 100′. Both the length of the projection of thefirst cutting portion 111 a in a plane perpendicular to the rotationaxis 100′ and the length of the projection of the second cutting portion112 a in a plane perpendicular to the rotation axis 100′ are greaterthan or equal to 10 mm and less than or equal to 600 mm. In an example,the length of the projection of the first cutting portion 111 a in aplane perpendicular to the rotation axis 100′ and the length of theprojection of the second cutting portion 112 a in a plane perpendicularto the rotation axis 100′ are greater than or equal to 20 mm and lessthan or equal to 400 mm. In this example, the length of the projectionof the first cutting portion 111 a in a plane perpendicular to therotation axis 100′ is about 236 mm. In one example, the length of theprojection of the first cutting portion 111 a in a plane perpendicularto the rotation axis 100′ and the length of the projection of the secondcutting portion 112 a in a plane perpendicular to the rotation axis 100′are substantially equal.

The mass of the blade assembly 11 is greater than or equal to 0.35 kgand less than or equal to 1.8 kg. When the mass of the blade assembly 11is within this value range, the lawn mower 100 has a relatively smallload and relatively high work efficiency. When the first blade 111 andthe second blade 112 is separately formed and the mass of the firstblade 111 is less than or equal to the mass of the second blade 112, theratio of the mass of the first blade 111 to the mass of the second blade112 is greater than or equal to 0.5 and less than or equal to 1. In anexample, when the first blade 111 and the second blade 112 areseparately formed and the mass of the second blade 112 is less than orequal to the mass of the first blade 111, the ratio of the mass of thesecond blade 112 to the mass of the first blade 111 is greater than orequal to 0.5 and less than or equal to 1.

The battery pack includes a battery pack housing and battery cells. Thebattery cells are disposed in the battery pack housing. The number ofbattery cells included in the battery pack is N and the unit is piece.The mass of the blade assembly 11 is M and the unit is kilogram. Themaximum length of a line connecting any two points of the projection ofthe blade assembly 11 in a plane perpendicular to the rotation axis 100′and the projection of the rotation axis 100′ in the plane is therotation diameter D of the blade assembly 11; and the unit ismillimetre. The product of the rotation diameter D (mm) of the bladeassembly 11, the number of battery cells N and mass M (g) of the bladeassembly 11 is greater than or equal to 3.5×10⁵ and less than or equalto 7.3×10⁷. In one example, the product of the rotation diameter D (mm)of the blade assembly 11, the number of battery cells N and mass M (g)of the blade assembly 11 is greater than or equal to 7×10⁵ (mm·g) andless than or equal to 3.6×10⁷ (mm·g). In one example, the product of therotation diameter D (mm) of the blade assembly 11, the number of batterycells N and mass M (g) of the blade assembly 11 is greater than or equalto 1.4×10⁶ (mm·g) and less than or equal to 1.8×10⁷ (mm·g). When theproduct of the rotation diameter D (mm) of the blade assembly 11, thenumber of battery cells N and mass M (g) of the blade assembly 11 is inthe above numerical range, the lawn mower 100 has a relatively smallload and relatively high work efficiency. In this example, the mass M ofthe blade assembly 11 refers to the total mass of the blade assembly 11including the first blade 111 and the second blade 112. When the lawnmower 100 includes multiple battery packs, the number N of battery cellshere refers to the total number of battery cells included in all batterypacks. In this example, the rotation diameter D of the blade assembly 11is about 508 mm, and the number N of battery cells contained in thebattery pack is equal to 10. In one example, the number N of batterycells refers to the number of battery cells included in the battery packthat powers the motor 13 that drives the blade assembly 11. If the lawnmower 100 is a self-propelled lawn mower, generally it also includes aself-propelled motor that drives the wheels to rotate. In this case, themotor 13 should not include the self-propelled motor. That is to say,the battery packs here do not include the battery pack that powers theself-propelled motor.

In one example, the larger value of the rotation diameter D1 of thefirst blade 111 and the rotation diameter D2 of the second blade 112 isdefined as the lateral dimension of the blade assembly 11. The batterypack contains the number N of battery cells, and the mass of the bladeassembly 11 is M (g). The product of the lateral dimension (mm) of theblade assembly 11, the number N of battery cells, and the mass M (g) ofthe blade assembly 11 is greater than or equal to 3.5×10⁵ (mm·g) andless than or equal to 7.3×10⁷ (mm·g). In one example, the product of thelateral dimension (mm) of the blade assembly 11, the number N of batterycells, and the mass M (g) of the blade assembly 11 is greater than orequal to 7×10⁵ (mm·g) and less than or equal to 3.6×10⁷ (mm·g). In oneexample, the product of the lateral dimension (mm) of the blade assembly11, the number N of battery cells, and the mass M (g) of the bladeassembly 11 is greater than or equal to 3.6×10⁷ (mm·g) and less than orequal to 1.8×10⁷ (mm·g).

The output torque of the motor 13 is greater than or equal to 0 and lessthan or equal to 10 N·m; in one example, the output torque of the motor13 is greater than or equal to 3 N·m and less than or equal to 8 N·m; inthis example, the output torque of the motor 13 is about 4 N·m. When theoutput torque of the motor 13 is in the above numerical range, the lawnmower 100 has higher cutting efficiency or cutting capacity.

In this example, the rotational inertia of the blade assembly 11 isgreater than or equal to 8000 kg·mm² and less than or equal to 23000kg·mm²; in one example, the rotational inertia of the blade assembly 11is greater than or equal to 15000 kg·mm² and less than or equal to 20000kg·mm².

In addition, under certain working conditions, the lawn mower 100 notonly needs to cut the vegetation, but also needs to chop up thevegetation clippings into finer pieces, or to collect the vegetationclippings into a collecting device. By adopting the structural design ofthe blade assembly 11 described above, the lawn mower 100 also has abetter ability to chop up grass or discharge grass. The lawn mower 100is also provided with a collecting device for collecting the vegetationclippings. The collecting device is connected to the deck 12. In anexample, the deck 12 is formed with a discharge chute; the collectingdevice is connected to the discharge chute to let the vegetationclippings enter the collecting device from the deck 12. When the bladeassembly 11 rotates at a tip linear velocity greater than or equal to 40m/s and less than or equal to 100 m/s, the average air velocity at thedischarge chute is greater than or equal to 3 m/s and less than or equalto 25 m/s. In an example, when the blade assembly 11 rotates at a tiplinear velocity greater than or equal to 40 m/s and less than or equalto 100 m/s, the average air velocity at the discharge chute is greaterthan or equal to 5 m/s and less than or equal to 15 m/s. When theaverage air velocity at the discharge chute is in the above numericalrange, the grass chopping ability and the grass discharging ability ofthe lawn mower 100 can be improved.

In this example, the linear velocity of the tip of the blade assembly 11refers to the linear velocity of the point on the blade assembly 11 withthe largest distance to the axis of rotation 100′ when the bladeassembly 11 rotates around the axis of rotation 100′.

Example 2

FIG. 11 is a schematic diagram of the blade assembly 21 of the lawnmower provided in Example 2 of the present application mounted to thedrive shaft 24. The difference between this example and the firstexample is that the blade assembly 21 in this example does not include aconnecting assembly, and the blade assembly 21 has a positioning portion213 and a engaging portion 214 to define the phase angle range betweenthe first blade 211 and the second blade 212, whereas the remainingstructure of the lawn mower of this example is the same as that ofExample 1. One of the first blade 211 and the second blade 212 is formedwith a positioning portion 213, and the other one is formed with aengaging portion 214 to engage with the positioning portion 213; whenthe positioning portion 213 and the engaging portion 214 engage witheach other, the second blade 212 is fixed or can rotate within apredetermined angle range relative to the first blade 211 in thecircumferential direction around the rotation axis 211′. That is to say,without the connecting assembly, the position of the second blade 212relative to the first blade 211 in the circumferential direction aroundthe rotation axis 211′ can be defined by the positioning portion 213 andthe engaging portion 214 only. In this example, the first blade 211 andthe second blade 212 are respectively provided with an engaging portion214 and a positioning portion 213. The positioning portion 213 is aprojection provided on the second blade 212 and protruding above theupper surface of the second blade 212; the engaging portion 214 is athrough hole provided on the first blade 211. When the first blade 211and the second blade 212 are mounted to the drive shaft 24, theprojection passes through the through hole and engages with the throughhole, thereby achieving the positioning of the first blade 211 relativeto the second blade 212 in the circumferential direction around therotation axis 211′. The positioning portion 213 may be a regularthree-dimensional structure such as a cylindrical shape or otherirregular shapes. The engaging portion 214 may be a through hole with acircular cross section or other through holes that can engage with thepositioning portion 213.

In an example, the specific structures of the positioning portion 213and the engaging portion 214 are not limited to the above projectionsand through holes. For example, the positioning portion 213 may be aprojection protruding from the second blade 212, and the engagingportion 214 may be an accommodating portion protruding upward on thesurface of the first blade 211; the accommodating portion canaccommodate at least part of the positioning portion 213 or engage withthe positioning portion 213, so as to realize the positioning of thefirst blade 211 relative to the second blade 212.

The number of the positioning portion 213 and the engaging portion 214is not limited. In an example, the number of the positioning portion 213and the engaging portion 214 are even and the positioning portion 213and the engaging portion 214 are respectively arranged symmetricallyabout the rotation axis 211′ to put uniform force on the first blade 211and the second blade 212, so that the position of the first blade 211relative to the second blade 212 is more stable.

Similar to Example 1, the positioning portion 213 according to thepresent example generally has a geometric center; the distance from thisgeometric center to the rotation axis 211′ is the positioning radius r′;the radius r′ of the positioning portion 213 is greater than or equal to0 mm and less than or equal to 50 mm. In one example, the positioningradius r′ of the positioning portion 213 is greater than or equal to theradius of the drive shaft 24 and less than or equal to 50 mm; in thisexample, the positioning radius r′ of the positioning portion 213 isabout 30 mm. When the positioning radius r′ is 0 mm, that is, thegeometric center of the positioning portion 213 coincide with therotation axis 211′. In one example, a radial groove is made on the driveshaft 24 to accommodate the positioning portion 213. The positioningportion 213 is provided outside the drive shaft 24, that is, thepositioning radius r′ of the positioning portion 213 is greater than orequal to the radius of the drive shaft 24. For a regularly shapedpositioning portion 213, the geometric center is uniquely determined;for an irregularly shaped positioning portion 213, a point at the centerof the positioning portion 213 may be roughly determined to be thegeometric center. The maximum length of a line connecting any two pointsof the projection of the blade assembly 21 in a plane perpendicular tothe rotation axis 211′ and the projection of the rotation axis 211′ inthe plane is the rotation diameter of the blade assembly 21. Therotation diameter is greater than or equal to 200 mm and less than orequal to 700 mm. In one example, the rotation diameter is greater thanor equal to 250 mm and less than or equal to 560 mm. In an example, theratio of the rotation diameter of the blade assembly 21 to thepositioning radius r′ of the positioning portion 213 is greater than orequal to 5 and less than or equal to 25. When the position of thepositioning portion 213 is within the above range, the positioningeffect of the positioning portion 213 is better. Correspondingly, theengaging portion 214 also has a geometric center, and the distance fromthe geometric center to the rotation axis 211′ is the positioning radiusof the engaging portion 214; the positioning radius of the engagingportion 214 is greater than or equal to 0 and less than or equal to 50mm; in one example, the positioning radius of the engaging portion 214is greater than or equal to the radius of the drive shaft 24 and lessthan or equal to 50 mm.

Example 3

FIG. 12 is a schematic diagram of a blade assembly and a connectionassembly of a lawn mower provided in Example 3 of the presentapplication. The difference from Example 1 and Example 2 lies in thestructure of the connecting assembly and the connection method betweenthe connecting assembly and the blade assembly, whereas othersimilarities can be applied to this example. The lawn mower includes aconnecting assembly 312; the connecting assembly 312 is formed with afirst connection portion 312 a that connects the first blade 311 and asecond connection portion 312 b that connects the second blade 313; thesecond blade 313, relative to the first blade 311, is fixed or canrotate within a predetermined angle range in the circumferentialdirection around the rotation axis 311′. That is to say, the first blade311 and the second blade 313 are fixed or can rotate within apredetermined angle range in the circumferential direction around therotation axis 311′ through the connecting assembly 312, and the firstblade 311 and the second blade 313 themselves do not constitute aconnection. In this example, the connecting assembly 312 is a flange,but it is not limited to a flange. The connecting assembly 312 forms afixed connection with the first blade 311 and the second blade 313respectively in the up-down direction to make the first blade 311 andthe second blade 313 construct a fixed phase angle. The connection ofthe connecting assembly 312 to the first blade 311 and the second blade313 may also be movable, so that the second blade 313 can rotate withina predetermined angle range relative to the first blade 311 in thecircumferential direction around the rotation axis 311′.

Example 4

FIGS. 13-16 are schematic views of a blade assembly 41 of a lawnmowerprovided in Example 4 of the present application. Similarly, the bladeassembly 41 rotates about the rotation axis 411′. The blade assembly 41in this example differs from the lawn mower in Example 1 only in thestructure of the second blade 412 of the blade assembly 41. Similaritiesto Example 1 can be applied to this example. In the direction parallelto the rotation axis 411′, the second cutting portion 412 a is locatedbelow the first cutting portion 411 a; in the circumferential directionaround the rotation axis 411′, the first cutting portion 411 a isprovided in front of the second cutting portion 412 a; second cuttingportion 412 a is disposed on the front edge of the second blade 412. Inan example, the front side in the circumferential direction around therotation axis 411′ refers to the side that first contacts the vegetationwhen the blade assembly 41 rotates along the rotation axis 411′ in thefirst direction A′. The first cutting portion 411 a contacts thevegetation prior to the second cutting portion 412 a; and the secondcutting portion 412 a is provided on the edge of the second blade 412that first contacts the vegetation. In this example, two first cuttingportions 411 a are respectively disposed on the front sides of both endsof the first blade 411, and the two first cutting portions 411 a arecenter symmetrical about the rotation axis 411′; two second cuttingportions 412 a are respectively disposed on the front sides of both endsof the second blade 412, and the two second cutting portions 412 a arecenter symmetrical about the rotation axis 411′, and the blade assembly41 as a whole is also center symmetrical about the rotation axis 411′.

The rear side of the second blade 412 is also formed with a first guideportion 412 b and a second guide portion 412 c that guide the upwardmovement of the airflow, that is, the second blade 412 is formed with afirst guide portion 412 b and a second guide portion 412 c on the sideopposite to the second cutting portion 412 a in the circumferentialdirection of the rotation axis 411′. The first guide portion 412 b andthe second guide portion 412 c are configured to guide the air flowupward. Here, the first guide portion 412 b and the second guide portion412 c refer to two at least partially separated entities. In thisexample, the first guide portion 412 b and the second guide portion 412c are integrally formed with the second blade 412; the first guideportion 412 b and the second guide portion 412 c extend substantiallyalong the direction perpendicular to the longitudinal direction of thesecond blade 412 and are sequentially arranged along the longitudinaldirection of the second blade 412. In one example, the first guideportion 412 b and the second guide portion 412 c may be respectivelyformed separately from the second blade 412 and fixedly connected to thesecond blade 412.

Each second cutting portion 412 a corresponds to a first guide portion412 b and a second guide portion 412 c. The first guide portion 412 band the second guide portion 412 c are disposed at the rear side of thesame end of the second cutting portion 412 a. In this example, since thesecond blade 412 is provided with two second cutting portions 412 a, twofirst guide portions 412 b and two second guide portions 412 c areformed, the two first guide portions 412 b and the two second guideportions 412 c are center symmetrical about the rotation axis 411′.

The first guide portion 412 b is curved upward along the first curvedsurface, and the second guide portion 412 c is curved upward along thesecond curved surface different from the first curved surface. In anexample, at least part of the first guide portion 412 b and at leastpart of the second guide portion 412 c have different curvatures. Thefirst guide portion 412 b and the second guide portion 412 c may eachhave a fixed curvature, or the curvatures of the first guide portion 412b and the second guide portion 412 c may change according to apredetermined rule or change irregularly, which is not limited herein.In this example, the first guide portion 412 b and the second guideportion 412 c each have varying curvatures. In one example, thecurvature radius at any point of the first guide portion 412 b and thesecond guide portion 412 c is equal to or greater than 0 and less thanor equal to 100 mm. In this example, the curvature radius at any pointof the first guide portion 412 b and the second guide portion 412 c isequal to or greater than 0 mm and less than or equal to 60 mm.

The second blade 412 includes at least a first guide portion 412 b and asecond guide portion 412 c. In this example, the second blade 412 isfurther provided with a third guide portion. In an example, the secondblade 412 may further be provided with a plurality of guide portionssuch as a fourth guide portion, and the plurality of guide portions aresequentially arranged along the extension direction of the second blade412.

The first guide portion 412 b and the second guide portion 412 c areboth curved up from the end of the second blade 412, the portion wherethe first guide portion 412 b starts to turn up is the first rootportion 412 d, and the portion where the second guide portion 412 cstarts to turn up is the second root portion 412 e. The first rootportion 412 d and the second root portion 412 e are approximately on thesame straight line, and this straight line intersects the extension lineof the blade edge of the second cutting portion 412 a obliquely, and theintersection angle β formed by the straight line and the extension lineof the cutting edge of the cutting portion 412 a is greater than orequal to 0 and less than or equal to 40 degrees. In an example, theintersection angle formed by the straight line and the extension line ofthe cutting edge of the second cutting portion 412 a is greater than orequal to 0 and less than or equal to 15 degrees. In this example, theintersection angle formed by the straight line and the extension line ofthe second cutting portion 412 a is about 6.9 degrees.

The outside of the first guide portion 412 b and the outside of thesecond guide portion 412 c extend substantially along the same straightline, and the straight line obliquely intersects the extension line ofthe second cutting portion 412 a. The outside of the first guide portion412 b refers to the edge opposed to the first root 412 d, and theoutside of the second guide portion 412 c refers to the edge opposed tothe second root 412 e. In this example, the extending direction of theoutside of the first guide portion 412 b and the outside of the secondguide portion 412 c is substantially parallel to the straight line wherethe first root portion 412 d and the second root portion 412 e arelocated.

In this example, a cutting portion opening is further formed on theoutside of the first guide portion 412 b and the outside of the secondguide portion 412 c. The cutting portion opening can further cutvegetation and improve the grass chopping ability of the lawn mower. Inan example, the cutting portion opening on the first guide portion 412 band the second guide portion 412 c is not necessarily a common cuttingportion structure, as long as it has predefined cutting capabilities.

Example 5

FIG. 17 is a schematic diagram of part of the structure of the lawnmower provided in Example 5 of the present application. This examplediffers from Example 1 in the structure of the blade assembly 51 and themounting assembly 56, whereas similarities to Example 1 can be appliedto this example.

As shown in FIGS. 17-19, the motor drives the blade assembly 51 torotate about the rotation axis 511′; the blade assembly 51 includes afirst cutting portion 511 a and a second cutting portion 512 aconfigured to cut vegetation; wherein in the direction parallel to therotation axis 511′, the second cutting portion 512 a is located belowthe first cutting portion 511 a; in this example, the blade assembly 51includes a first blade 511 and a second blade 512, and the first cuttingportion 511 a is disposed on the first blade 511, the second cuttingportion 512 a is disposed on the second blade 512, and the first blade511 is mounted above the second blade 512 in the direction of therotation axis 511′. The mounting assembly 56 includes a drive member561, the drive member 561 is configured to drive the blade assembly 51to rotate about the rotation axis 511′; the blade assembly 51 isdetachably connected to the drive member 561. In an example, the drivemember 561 is connected to the drive shaft 54 and rotates synchronouslywith the drive shaft 54. The drive member 561 and the drive shaft 54form a fixed connection along the circumferential direction of therotation axis 511′, such as a flat connection or a threaded connection.

In this example, the mounting assembly 56 further includes a driveportion 561 a, the drive portion 561 a is fixedly connected to the drivemember 561 or integrally moulded with the drive member 561; the driveportion 561 a is connected to the blade assembly 51 so that bladeassembly 51 forms a fixed connection along the circumferential directionof the rotation axis 511′ relative to the drive member 561 or the bladeassembly 51 rotates within a predetermined angle range relative to thedrive member 561 along the circumferential direction of the rotationaxis 511′. In an example, the drive portion 561 a is respectivelyconnected to the first blade 511 and the second blade 512, and drive thefirst blade 511 and the second blade 512 are to rotate synchronouslywith the drive portion 561 a. There is no limitation on the positionwhere the drive portion 561 a is provided and the number of driveportions 561 a. In this example, the number of drive portions 561 a istwo, and the two drive portions 561 a are respectively disposed on twosides of the rotation axis 511′, and the first blade 511 and the secondblade 512 are stacked together in the direction of the rotation axis511′ with at least partial contact. Both of the two drive portions 561 aare connected to the first blade 511 and the second blade 512; the firstblade 511 and the second blade 512 are formed with positioning holesengaging with the two drive portions 561 a; one of the drive portion 561a is substantially cylindrical and forms a rotational connection withthe first blade 511 and the second blade 512; the other drive portion561 a forms a flat connection with the first blade 511 and the secondblade 512. In other examples, only one drive portion 561 a may beprovided; the drive portion 561 a and the blade assembly 51 form a flatconnection. Alternatively, two cylindrical drive portions 561 a may beprovided to connect to the blade assembly 51.

The mounting assembly 56 further includes a clamping assembly 562 and afastening assembly 563; the clamping assembly 562 is configured to clampthe blade assembly 51 along the rotation axis 511′, and the bladeassembly 51 is disposed between the drive member 561 and the clampingassembly 562 in a direction parallel to the rotation axis 511′; thefastening assembly 563 is set to fix the position of the blade assembly51 relative to the drive member 561 in the direction parallel to therotation axis 511; the fastening assembly 563 is removably connected tothe drive shaft 54. In this example, the clamping assembly 562 may beone or more metal shims and is at least partially in contact with theblade assembly 51; the fastening assembly 563 may be a nut, screw, orbolt, etc. The fastening assembly 563 is connected to the drive shaft 54and pushes against the clamping assembly 562. In this example, the driveshaft 54 passes through the blade assembly 51 and the clamping assembly562; the fastening assembly 563 and the drive shaft 54 form a threadedconnection. In an example, when the fastening assembly 563 includes abolt or a screw, etc., there may be a fastening assembly 563 passingthrough at least one of the blade assembly 51 and the clamping assembly562. The fastening assembly 563 and the drive shaft 54 form a fixed anddetachable connection.

The mounting assembly 56 further includes an insulating member 564; theinsulating member 564 is configured to achieve the insulation betweenthe blade assembly 51 and the drive shaft 54; the insulating member 564is made of insulating materials; the insulating member 564 is providedbetween the clamping unit 562 and the blade assembly 51 in the directionof the rotation axis 511′; the first blade 511 and the second blade 512are both disposed between the drive member 561 and the insulating member564. In this example, the insulating member 564 is in surface contactwith the blade assembly 51 and the clamping assembly 562. A groove 564 ais formed at the bottom of the insulating member 564 in the direction ofthe rotation axis 511′, and the clamping assembly 562 is embedded in thegroove 564 a. The drive shaft 54 or the fastening assembly 563 passesthrough the insulating member 564.

In this example, the lawn mower does not include a connecting assemblythat connects the first blade 511 and the second blade 512 as a wholebefore installation. That is to say, the first blade 511 and the secondblade 512 are two independently formed and independently mounted blades,which are respectively mounted to the drive shaft 54 and constituted bythe mounting assembly 56. In this example, the blade assembly 51 isconnected through the drive portion 561 a so that the phase anglebetween the first blade 511 and the second blade 512 is substantiallyunchanged.

Example 6

FIG. 20 is a schematic diagram of a part of the structure of the lawnmower provided in Example 6 of the present application. The differencebetween this example and Example 5 is the structure of the mountingassembly 66, whereas the similarities to Example 5 can be applied tothis example.

As shown in FIGS. 20-22, the mounting assembly 66 in this examplediffers from the mounting assembly 56 in Example 5 in the structure ofthe insulating member 664. In this example, in the direction of therotation axis 611′, two grooves, an upper groove 664 a and a lowergroove 664 b, are provided above and below the insulating member 664;and the first blade 611 and the second blade 612 are provided in theupper groove 664 a; the clamping assembly 662 is disposed in the lowergroove 664 b. The shape of the upper groove 664 a fits the bladeassembly 61 so that the first blade 611 and the second blade 612 form apredetermined phase angle along the rotation axis 611′. As in Example 5,the drive member 661 is provided with a drive portion 661 a (referringto FIG. 20). In this example, the design of the insulating member 664not only better realizes the insulation between the blade assembly 61and the drive shaft, but also helps the blade assembly 61 maintain afixed phase angle to prevent slippage; at the same time, it isbeneficial for the drive member 661 to drive the blade assembly 61 moreefficiently.

Example 7

FIG. 23 is a schematic diagram showing a part of the structure of thelawn mower provided in Example 7 of the present application. Thedifference between this example and Example 6 lies in the structure ofthe mounting assembly 76; similarities to Example 6 can be applied tothis example.

As shown in FIGS. 23-25, the mounting assembly 76 in this examplediffers from the mounting assembly 66 in Example 6 in the structure ofthe drive member 761 and the insulating member 764. In this example, thedrive member 761 drives the blade assembly 71 by friction. The drivemember 761 and the blade assembly 71 form at least partial contactthrough the clamping assembly and the fastening assembly. In thisexample, the drive member 761 and the blade assembly 71 are in surfacecontact and are pressed against each other, and a positive pressure inthe direction of the rotation axis 701 is formed between the drivemember 761 and the blade assembly 71. When the drive shaft drives thedrive member 761 to rotate about the rotation axis 701, the bladeassembly 71 rotates about the rotation axis 701 under the frictionalforce along the circumferential direction of the rotation axis 701. Thatis to say, there is no need to provide a drive portion for driving theblade assembly 71 on the drive member 761, and there is no need toprovide a positioning hole on the blade assembly 71 to engage with thedrive portion. The drive member 761 drives the first blade 711 byfriction, and the first blade 711 drives the second blade 712 by drivingthe insulating member 764. The insulating member 764 is disposed betweenthe first blade 711 and the second blade 712; the insulating member 764is also formed with an upper groove 764 a and a lower groove 764 b; thefirst blade 711 is disposed in the upper groove 764 a, and the secondblade 712 is disposed in the lower groove 764 b. That is to say, thefirst blade 711 is disposed between the drive member 761 and theinsulating member 764; the second blade 712 is disposed between theinsulating member 764 and the clamping assembly 762. In an example, theupper groove 764 a and the lower groove 764 b are fitted to the edges ofthe first blade 711 and the second blade 712 respectively to make thefirst blade 711 and the second blade 712 to form a phase angle of thepredetermined range. The clamping assembly 762 is pressed to the secondblade 712. In this example, the clamping assembly 762 is attached to thelower surface of the second blade 712.

Example 8

FIG. 26 is a schematic diagram of a part of the structure of the lawnmower provided in Example 8 of the present application. This examplediffers from Example 5 in the structure of the blade assembly 81 and themounting assembly 86. Similarities to Example 5 can be applied to thisexample. The blade assembly 81 includes at least two separately formedfirst blades 811 and an integrally formed second blade 812. In thisexample, the number of first blades 811 is two and each of the firstblades 811 is provided a first cutting portion 811 a; the second blade812 is provided with a second cutting portion 812 a. In the direction ofthe rotation axis 801, the first blades 811 are located above the secondblade 812. The two first blades 811 are respectively located on bothsides of the rotation axis 801 and are fixedly connected to the secondblade 812. In an example, the first blade 811 is detachably connected tothe second blade 812. In other examples, the first blade 811 is anintegrally formed blade, and the second blade 812 is a plurality ofseparately formed blades, each being fixedly connected to the firstblade 811. A first cutting portion 811 a and a second cutting portion812 a are respectively provided on the first blade 811 and the secondblade 812. In an example, the first blade 811 and the second blade 812are integrally formed, but the first cutting portion 811 a and thesecond cutting portion 812 a are respectively provided on the firstblade 811 and the second blade 812. That is to say, the blade assembly81 is a one-piece blade, but is provided with a plurality of firstcutting portions 811 a and second cutting portions 812 a distributed upand down along the direction of the rotation axis 801.

In this example, the drive member 861 is provided with a drive portion,and the blade assembly 81 is provided with a positioning hole thatengages with the drive portion. The drive portion 861 drives the bladeassembly 81 to rotate through the drive portion. In an example, thedrive portion is connected to the first blade 811. The shape and numberof drive portion is not limited. In one example, the drive member 861 isnot provided with a drive portion; instead, the drive member 861 ispressed to the blade assembly 81 and drives the blade assembly 81 torotate about the rotation axis 801 by friction.

Example 9

FIG. 27 is a schematic diagram of a lawn mower 100 connected with agrass pressing assembly 20 according to Example 9, wherein the lawnmower 100 according to the present example is the same as the lawn mowerof Example 1, except that only the lawn mower 100 in this example isconnected with a grass pressing assembly 20. The lawn mower 100 includesa blade assembly 11 and a deck 12. The blade assembly 11 is configuredto perform the cutting function of the lawn mower 100; the deck 12 isformed with an accommodation space for accommodating at least part ofthe blade assembly 11. In this example, the blade assembly 11 is totallylocated inside the accommodation space. The lawn mower 100 has atravelling direction 101′ when travelling along a straight line on theground. In this example, the travelling direction 101′ is parallel tothe front-rear direction. All usages of “assembly” in this applicationrefer to a combination including at least one component or part, whichrealizes a specific function through interaction or coordination. Thelawn mower 100 in the present application may be either a hand-push lawnmower or a riding lawn mower. For the convenience of explaining thetechnical solution of the present application, the up-down direction andthe front-rear direction are defined as shown in FIG. 27.

As shown in FIGS. 27-30, the grass pressing assembly 20 is connected tothe lawn mower 100. In one example, the grass pressing assembly 20 isdetachably connected to the rear end of the lawn mower 100. The grasspressing assembly 20 is configured to compact the lawn, and the grasspressing assembly 20 serves as an accessory for the user to selectivelyassemble according to specific needs. The lawn mower 100 includes amounting shaft 17; the mounting shaft 17 is perpendicular to thetravelling direction 101′; the grass pressing assembly 20 is rotatablyconnected to the mounting shaft 17 so that the grass pressing assembly20 can rotate about the mounting shaft 17. The mounting shaft 17 heremay be a shaft body of the lawn mower 100, or may be a wheel shaft ofthe wheels, or may be another shaft body. That is to say, the grasspressing assembly 20 can be detachably connected to the mounting shaft17, and there is no need to add another installation structure formounting the grass pressing assembly 20 to the lawn mower 100, bringingthe advantage of convenient installation. For any type of lawn mower100, as long as it has an existing shaft body, the grass pressingassembly 20 in this example can be installed on the lawn mower 100,which has the advantage of strong adaptability.

As shown in FIG. 28, the grass pressing assembly 20 includes a drum 201,a connecting portion 202, and a supporting portion 203. Wherein, thedrum 201 has a predetermined weight so that the drum 201 always appliespressure to the ground, and the pressure is large enough to compact thelawn. That is to say, the grass pressing assembly 20 in this examplemainly applies pressure to the lawn by the weight of the drum 201. Theconnecting portion 202 and the mounting shaft 17 form a rotatableconnection, that is, the connecting portion 202 can rotate about themounting shaft 17. In this example, the connecting portion 202 isgenerally hook-shaped with openings in the circumferential direction.After the connecting portion 202 is hooked to the mounting shaft 17, theconnecting portion 202 is sealed in the circumferential direction byfasteners such as screws or bolts so that the mounting shaft 17 cannotbe separated from the connecting portion 202 in the radial direction.

As shown in FIG. 29, the supporting portion 203 connects the drum 201and the connecting portion 202. The supporting portion 203 and theconnecting portion 201 may be formed integrally or separately. Thesupporting portion 203 includes a first support arm 2031 and a secondsupport arm 2032. The drum 201 has a length direction. The first supportarm 2031 and the second support arm 2032 extend at least partially alongthe direction perpendicular to the length direction of the drum 201. Thelength direction of the drum 201 is parallel to the axis 171 of themounting shaft 17.

In this example, the first support arm 2031 connects the first end ofthe drum 201 and the connecting portion 202, and the second support arm2032 connects the second end of the drum 201 and the connecting portion202. The supporting portion 203 further includes a third support arm2033, and the third support arm 2033 is fixedly connected to the firstsupport arm 2031 and second support arms 2032 to increase the overallstrength and rigidity of the supporting portion 203. The third supportarm 2033 extends in a direction parallel to the mounting shaft 17, andthe two ends of the third support arm 2033 are respectively connected tothe first support arm 2031 and the second support arm 2032.

The drum 201 has a mid-division plane 21′ perpendicular to the lengthdirection, and the drum 201 is symmetrical about the mid-division plane21′; the supporting portion 203 has a symmetry plane 22′. The supportingportion 203 is symmetrical about the symmetry plane 22′. The symmetryplane 22′ is parallel or coincides with the mid-division plane 21′. Whenthe connecting portion 202 is mounted to the middle position of themounting shaft 17, the symmetry plane 22′ coincides with themid-division plane 21′. In other examples, the connecting portion 202may be installed at any position in the axial direction of the mountingshaft 17.

As shown in FIG. 30, the drum 201 includes a central shaft 2011 and acylindrical portion 2012. The central shaft 2011 extends along thelength direction of the drum 201; the cylindrical portion 2012 rotatesaround the central shaft 2011, and the cylindrical portion 2012 isbasically a hollow cylindrical shape; both the central shaft 2011 andthe cylindrical portion 2012 are made of metal. The central shaft 2011and the supporting portion 203 are connected together by screws, and thecentral shaft 2011 and the screw form a threaded connection, that is,the central shaft 2011 and the supporting portion 203 constitute a fixedconnection, and the cylindrical portion 2012 can rotate relative to thecentral shaft 2011. In an example, the screw can be replaced with a boltfixedly connected to the supporting portion 203 so that the centralshaft 2011 can rotate about the bolt; in other words, the screw and thecentral shaft 2011 constitute a rotational connection, and the centralshaft 2011 can rotate relative to the screw.

In this example, the lawn mower 100 includes an adjustment assembly foradjusting the height of the deck 12 from the ground, and the grasspressing assembly 20 is connected to a shaft body on the adjustmentassembly. The adjustment assembly in this example is mainly composed ofa linkage mechanism. When the user adjusts the height of the deck 12from the ground, the height of the adjustment assembly from the groundalso changes. That is to say, the height of the mounting shaft 17 fromthe ground is variable. In this example, the mounting shaft 17 isparallel to the ground. The distance d from the axis 171 of the mountingshaft 17 to the axis 2011 a of the central shaft 2011 of the drum 201 islong enough so that regardless of the height of the mounting shaft 17from the ground, the drum 201 still contacts the ground and is supportedby the ground. That is, the distance d between the axis 2011 a of thecentral shaft 2011 and the axis 171 of the mounting shaft 17 is greaterthan the maximum distance between the axis 171 of the mounting shaft 17and the ground.

Example 10

FIG. 31 is a schematic diagram of the grass pressing assembly 20′provided by Example 10 of the present application. Compared with Example9, the difference only lies in the structure of the supporting portion203′, so only the supporting portion 203′ will be described below. Thesupporting portion 203′ includes a first support arm 2031′, a secondsupport arm 2032′, and a third support arm 2033′. The two ends of thethird support arm 2033′ are respectively connected to the two ends ofthe drum 201′; the two ends of the first support arm 2031′ arerespectively connected to the third support arm 2033′ and the connectingportion 202′, and the two ends of the second support arm 2032′ arerespectively connected to the third support arm 2033′ and the connectingportion 202′. Among them, the connection of the first support arm 2031′and the second support arm 2032′ are fixed connections, including weldedconnection or threaded connection. The two ends of the third support arm2033′ extend approximately in a direction perpendicular to the mountingaxis 17′, the middle part of the third support arm 2033′ extendsapproximately in a direction parallel to the mounting axis 17′, thefirst support arm 2031′ and the second support arm 2032′ extend in adirection perpendicular to the mounting axis 17′.

Example 11

FIG. 32 is a schematic diagram of a lawn mower 50 provided in Example 11of the present application. Compared with Example 1, the differencemainly lies in the structure and position arrangement of the lightingassembly. The following mainly introduces the lighting assembly 508. Asshown in FIGS. 32-34, the lawn mower 50 includes a main body 501 and anoperating device 502. The main body 501 includes a main body housing5011, a prime mover, and a working assembly 5013, wherein the workingassembly 5013 includes working elements that perform the tool functionsof garden tools. For the lawn mower 50, the working element is a cuttingelement arranged for mowing, further, is a blade assembly 5013 a. Themain body housing 5011 is configured to install a prime mover and aworking element that outputs power. For the lawn mower 50, the main bodyhousing 5011 may include a deck 60. The prime mover is configured tooutput power to the working element to drive the movement of the workingelement. In this example, the prime mover is a motor 5012 capable ofdriving the blade assembly 5013 a to rotate. The operating device 502 isconfigured for user operation to control the main body 501, and theoperating device 502 includes an operating element for user operation,the operating element being a trigger 5021. As a hand-push power tool,the lawn mower 50 also includes a connecting rod assembly, which isconnected to the main body 501 and the operating device 502. The lawnmower 50 further includes a pair of walking wheels 5014. The walkingwheels 5014 drive the lawn mower 50 to walk on the ground. The twowalking wheels 5014 are symmetrically disposed on both sides of thefirst plane 501′.

The connecting rod assembly includes a pair of connecting rods 5031, andthe connecting rod 5031 connects the main body 501 and the operatingdevice 502. The two connecting rods 5031 are arranged symmetrically onboth sides of the first plane 501′. In the present example, the area atthe end of the connecting rod assembly 503 where the operating device502 is provided is defined as the operating area 505, the area at theend of the connecting rod assembly 503 where the main body 501 isprovided is defined as the work area 503, the operating device 502 islocated in the operating area 505, the main body 501 is located in thework area 503. The connecting rod assembly further includes an armrest5032; the armrest 5032 is configured for a user standing in an operationposition to hold and push the lawn mower 50. The armrest 5032 connectsthe two connecting rods 5031 and is located at the end of the connectingrods 5031 away from the main body 501.

As shown in FIGS. 32-35, a signal acquisition system 5023 is alsoprovided in the operating area 505. The signal acquisition system 5023is connected to the operating device 502 to receive input information ofthe operating device 502. A signal output system 5015 is also providedin the working area 503, and the signal output system 5015 is configuredto control the output of the working assembly 5013. The operating device502 further includes a console 5022; the console 5022 connects the twoconnecting rods 5031; the console 5022 is located between the armrest5032 and the main body 501. The trigger 5021 and the console 5022constitute a rotational connection. The user can rotate the trigger 5021so that the trigger 5021 fits to the armrest 5032. The user's handsimultaneously holds the trigger 5021 and the armrest 5032. The signalacquisition system 5023 is arranged in a space surrounded by the console5022. The signal output system 5015 is arranged in a space surrounded bythe main body housing 5011.

The lawn mower 50 further includes a signal line assembly 504; thesignal line assembly 504 is connected to the signal output system 5015and the signal acquisition system 5023 so that the signal output system5015 and the signal acquisition system 5023 constitute a communicationconnection. In this way, after the signal acquisition system 5023collects the signals output by the operating device 502, the signal lineassembly 504 transmits the information to the signal output system 5015.The signal output system 5015 controls the working assembly 5013 toperform the corresponding function in a corresponding state.

The signal acquisition system 5023 includes a signal circuit board 5023a, and the signal output system 5015 includes a first output circuitboard 5015 a. The first output circuit board 5015 a is connected to themotor 5012. The signal circuit board 5023 a is configured to install orconnect a signal switch, which is controlled by the operating element.The first output circuit board 5015 a sends signals to the workingelements, electronic switches, circuit boards, etc. in the working area503. The signal line assembly 504 comprises a first signal line 5041;the first signal line 5041 is connected to the first output circuitboard 5015 a and the signal circuit board 5023 a in order to achieve thecommunication between the first output circuit board 5015 a and thesignal circuit board 5023 a.

Garden tools in related technologies connect multiple electroniccomponents through power lines and electronic switches. The power lossis large, the cost of cables is high, and the wiring is complicated,resulting in chaos in the internal structure of the machine. In thisexample, the first signal line 5041 is used to connect the signalcircuit board 5023 a and the first output circuit board 5015 a, and abus signal line can realize the connection between multiple electroniccomponents. Therefore, regarding the lawn mower 50 of this example, thepower loss is low, the cost of the cable is low, and the wiring issimple, so that the internal structure of the machine is simple.Moreover, because there are few cables inside the lawn mower 50, thecable arrangement is simple, the stability of the lawnmower 50 is good,it is not easy to be damaged, and maintenance is relatively convenient.

In this example, the signal acquisition system 5023 is only providedwith one signal circuit board 5023 a. In other examples, the signalacquisition system 5023 also includes multiple signal circuit boards5023 a, and the multiple signal circuit boards 5023 a arecommunicatively connected through signal lines.

The lawn mower 50 further comprises a power supply; the power supply isa battery pack 5016; the battery pack 5016 is configured to power themotor 5012; the battery pack 5016 and the motor 5012 are both mounted onthe main body 501. The signal output system 5015 further includes asecond output circuit board 5015 b, and the second output circuit board5015 b is disposed in the main body housing 5011. The second outputcircuit board 5015 b and the battery pack 5016 constitute acommunication connection. The first signal line 5041 is also connectedto a splitter 5042, which is connected to two output terminals 5042 a,which are respectively connected to the first output circuit board 5015a and the second output circuit board 5015 b (referring to FIG. 34 andFIG. 35). Thus, the first output circuit board 5015 a is communicativelyconnected to the first signal circuit board 5023 a through the firstsignal line 5041, and the second output circuit board 5015 b iscommunicatively connected to the first signal circuit board 5023 athrough the first signal line 5041.

In this example, the working assembly 5013 further includes otherfunctional elements that implement additional functions of the lawnmower 50, and the functional elements may be, for example, a lightingelement 5081 or a self-propelled motor. In this example, the lightingelement 5081 is an example of the functional elements. The lawn mower 50also includes a third output circuit board 5015 c that controls thelighting element 5081, and the third output circuit board 5015 c isconnected to the first output circuit board 5015 a.

The first output circuit board 5015 a is also installed or connectedwith a first access terminal 5015 d, and the first access terminal 5015d is configured to receive a signal output by the first signal line5041. The second output circuit board 5015 b is also installed orconnected with a second access terminal 5015 e, which is configured toreceive the signal output by the first signal line 5041. The firstaccess terminal 5015 d is connected to one of the two output terminals5042 a connected to the splitter 5042, and the second access terminal5015 e is connected to the other one of the two output terminals 5042 aconnected to the splitter 5042. The two output terminals 5042 a areprovided with USB female sockets, and the first access terminal 5015 dand the second access terminal 5015 e are provided with USB malesockets. In one example, the USB female socket is a TYPE-C femalesocket, and the USB male socket is a TYPE-C male socket. In this way,the signal line assembly 504 has good versatility, is convenient formaintenance, and can improve the stability of the lawn mower 50. Inother examples, the output terminal 5042 a may be provided with a USBmale socket, and the first access terminal 5015 d and the second accessterminal 5015 e may be provided with a USB female socket.

Example 12

FIG. 36 is a schematic diagram of a lawn mower 50 provided in Example12. The signal output system 5051 of the lawn mower 505 includes a firstoutput circuit board 5052 and a second output circuit board 5053. Themotor 5054 and the battery pack 5055 are both connected to the firstoutput circuit board 5052, and the signal circuit board 5056 and thefirst output circuit board 5052 are connected by a signal line. Thesecond output circuit board 5053 is connected to the functional element5057 which is configured to realize other functions of the lawn mower505.

As shown in FIG. 32 and FIG. 37, the lawn mower 50 further includes alighting assembly 508 and a status display assembly 509. Lightingassembly 508 includes a lighting switch 5082 and a lighting element 5081as shown in FIG. 32. The lighting element 5081 is disposed in theworking area 503 to illuminate the region on the front side of the lawnmower 50 so as to facilitate the user working in poor lightingconditions. The lighting element 5081 is provided on the main body 501,further, the lighting element 5081 is provided on the main body housing5011. The lighting switch 5082 is provided for user operation to controlwhether the lighting element 5081 is turned on. The status displayassembly 509 includes a status indicator light 5091. The statusindicator light 5091 can display the working status of the lawn mower50. The status indicator light 5091 can also display whether the lawnmower 50 is activated. Among them, the lighting switch 5082 and thestatus indicator light 5091 are both located in the operating area 505.In this way, when the user stands on the rear side of the operatingdevice 502, the user can conveniently operate the lighting switch 5082to light up the lighting element 5081. Especially during the operationof the lawn mower 50, the user does not need to release the trigger 5021and come to the side or the front of the lawn mower 50 to activate thelighting element 5081. Therefore, the user can conveniently operate thelighting switch 5082 at any time during the operation of the lawn mower50, which improves the operational convenience. Moreover, the user caneasily observe the display state of the status display assembly 509,without leaving the operating area.

The lighting switch 5082 and the status indicator light 5091 are bothprovided on the console 5022; also, the lighting switch 5082 and thestatus indicator light 5091 are located between the trigger 5021 and themain body 501, thereby facilitating user operations.

As shown in FIGS. 33, 36, and 37, a safety switch 5024 is also providedin the middle of the console 5022. The safety switch 5024 and thetrigger 5021 constitute a switch group for starting the motor 5054. Whenone of the safety switch 5024 and the trigger 5021 is not activated, thelawn mower 50 is not started. After the safety switch 5024 is activated,the user activates the trigger 5021. If the safety switch 5024 is notactivated, the motor 5054 does not start when the user activates thetrigger 5021. Among them, the lighting switch 5082 and the statusindicator light 5091 are respectively located on both sides of thesafety switch 5024, therefore, the structure layout on the console 5022is more reasonable, and it is more convenient for the user to operatethe lawn mower 50.

In this example, the lighting switch 5082 and the status indicator light5091 are also disposed on both sides of the first plane 501′, whichfacilitates the user to operate the lighting switch 5082 and to observethe display status of the status indicator light 5091. In otherexamples, the lighting switch 5082 may also be provided on the armrest5032 or near the armrest 5032, so long as the user can operate thelighting switch 5082 when standing on the rear side of the lawn mower 50without leaving the operating area 505.

The armrest 5032 includes a cross bar 5032 a; the cross bar 5032 a isfor the user to grip and the cross bar 5032 a extends in a directionperpendicular to the connecting rod 5031. The minimum distance betweenthe lighting switch 5082 and the cross bar 5032 a is greater than orequal to 0 cm and less than or equal to 30 cm. In this way, the user canextend the arm to operate the light switch 5082 when holding the crossbar 5032 a.

In one example, the lighting switch 5082 is a membrane switch, whichtakes up little space and has a low manufacturing cost. The lightingswitch 5082 is also provided with an LED lamp for the user to easilyobserve whether the lighting switch 5082 is triggered in a relativelybright environment.

In this example, the number of status indicator lights 5091 is five, andthe five status indicator lights 5091 are respectively: working statusindicator light, working shape indicator light, temperature statusindicator light, load status indicator light and power status indicatorlight. The working status indicator light indicates whether the lawnmower 50 is started, so whether the lawn mower 50 has been damaged isdetermined by the display status of the working status display light.The working shape indicator light shows the folding state of the lawnmower 50 or the telescopic state of the connecting rod assembly 503 ofthe lawn mower 50. The temperature status display light indicateswhether the temperature of the battery pack 5055 or the motor 5054exceeds a predetermined threshold. The load status indicator lightindicates whether the lawn mower 50 is in an overload state. The powerstatus indicator light displays the remaining power of the battery pack5055, or whether the remaining power of the battery pack 5055 is lowerthan a predetermined threshold.

As shown in FIGS. 32, 33, and 38, the deck 60 is formed with anaccommodation space 60 a covering the blade assembly 5013 a. In theaccommodation space 60 a, the blade assembly 5013 a rotates about therotation axis 504′ to perform the cutting function.

As shown in FIG. 38 and FIG. 41, the lawn mower 50 has a discharge modeand a mulch mode. When the lawn mower 50 is in the discharge mode, thegrass clippings can be discharged out of the deck 60. When the lawnmower is in the mulch mode, the grass clippings will fall under the deck60.

As shown in FIGS. 38-40, the deck 60 includes a vortex portion 601 and adischarge portion 602. The vortex portion 601 extends around thecircumferential direction of the rotation axis 504′ to form a vortex inthe accommodation space 60 a. The vortex portion 601 forms a vortexchannel 6011, and the vortex flows along a flow path 60 b in the vortexchannel 6011. The flow path 60 b also basically extends in thecircumferential direction around the rotation axis 504′. The dischargeportion 602 is provided on the flow path 60 b of the vortex. Thedischarge portion 602 extends from the vortex portion 601 in thetangential direction of the vortex, and the discharge portion 602 guidesthe vortex flow out in the tangential direction of the flow path 60 b.Therefore, when the lawn mower 50 is in the discharge mode, thedischarge portion 602 can guide the grass clippings to move along theflow path 60 b of the vortex channel 6011 first, and then when the grassclippings move to the discharge portion 602, the discharge portion 602will guide a portion of grass clippings away from the deck 60 along thetangential direction of the flow path 60 b to discharge this portion ofgrass clippings to the outside of the lawn mower 50, or collect thisportion of grass clippings into a grass basket.

As shown in FIG. 41, the lawn mower 50 further includes a plug 6017.When the plug 6017 is installed in the discharge portion 602, thedischarge portion 602 is sealed, so that the lawn mower 50 is in themulch mode. When the plug 6017 is not attached to the discharge portion602, the discharge portion 602 is opened, and the airflow can flow outfrom the discharge portion 602, therefore the lawn mower 50 is in thedischarge mode.

In the present example, as shown in FIG. 38 and FIG. 40, the deck 60further comprises a stop portion 603; the stop portion 603 is configuredto prevent the vortex from keeping circulating in the vortex portion 601while flowing through the discharge portion 602, thereby increasing theflow rate of the vortex from the discharge portion 602. At least aportion of the discharge portion 602 and at least a portion of the stopportion 603 is on the same side of the first plane 501′, and the firstplane 501′ passes through the rotation axis 504′. The stop of the vortexby the stop portion 603 can increase the flow rate of the vortex fromthe discharge portion 602 when the lawn mower 500 is in the dischargemode, thereby improving the grass collection efficiency of the grassclippings, and on the other hand, when the lawn mower 500 is in themulch mode, the grass clippings can be stopped so that some of the grassclippings fall into the cutting area of the blade assembly 5013 a againto be cut by the blade assembly 5013 a again, thereby improving thegrass chopping ability.

In one example, the deck 60 further includes a mounting portion 604; themounting portion 604 is configured to mount the motor 5054. The mountingportion 604 is formed with a hole 6041 around the rotation axis 504′that allows the motor shaft to pass.

As shown in FIG. 39, the vortex portion 601 includes an inner ring 6012,an outer ring 6013, and a bottom surface 6014. The inner ring 6012 isformed around the rotation axis 504′, and the inner ring 6012 isconnected to the mounting portion 604. The outer ring 6013 is disposedaround the inner ring 6012. The bottom surface 6014 connects the innerring 6012 and the outer ring 6013. The vortex channel 6011 of the vortexportion 601 is formed between the inner ring 6012 and the outer ring6013.

The discharge portion 602 includes a first discharge surface 6021, asecond discharge surface 6022, and a discharge bottom surface 6023. Thefirst discharge surface 6021 is connected to the inner ring 6012, andthe second discharge surface 6022 is connected to the outer ring 6013.The first discharge surface 6021 extends from the inner ring 6012substantially along a tangential direction of the inner ring 6012, andthe second discharge surface 6022 extends from the outer ring 6013substantially along a tangential direction of the outer ring 6013. Thedischarge bottom surface 6023 connects the first discharge surface 6021and the second discharge surface 6022. The discharge bottom surface 6023is also connected to the bottom surface 6014 of the vortex section 601.

The stop portion 603 includes a stop surface 6031 and a connectingsurface 6032. The stop surface 6031 is configured to stop the airflowflowing in the vortex portion 601 so that the airflow flows out of thedischarge portion 602. The discharge portion 602 is substantiallylocated on the first side of the first plane 501′. In this example, ifmore than 90% of the discharge portion 602 is located on the first sideof the first plane 501′, it is considered that the discharge part 602 issubstantially located on the first side of the first plane 501′. Thestop surface 6031 is also located on the first side of the first plane501′, that is, the stop surface 6031 and the discharge portion 602 arelocated on the same side of the first plane 501′. Or, in other examples,the stop surface 6031 and a portion of the discharge portion 602 arelocated on the same side of the first plane 501′. Alternatively, inother examples, at least a portion of the stop surface 6031 and at leasta portion of the discharge portion 602 are located on the same side ofthe first plane 501′.

The stop portion 603 is provided at the edge of the discharge portion602. In an example, the stop surface 6031 is disposed at the firstdischarge surface 6021, and the stop surface 6031 extends from the innerring 6012 to the outer ring 6013. The stop surface 6031 also extendsfrom the bottom surface 6014 to the direction away from the bottomsurface 6014, that is, one side of the stop surface 6031 is connected tothe junction of the bottom surface 6014 and the first discharge surface6021. The connecting surface 6032 extends from a side of the stopsurface 6031 away from the bottom surface 6014 along a plane obliquelyintersecting the stop surface 6031, and the connecting surface 6032connects the stop surface 6031 and the bottom surface 6014.

In this example, the stop portion 603 is integrally formed with thevortex portion 601, and the recess of the vortex portion 601 towards theground forms the stop portion 603. The stop portion 603 is locatedinside the vortex portion 601, the stop portion 603 is also located inthe vortex channel 6011 formed by the vortex portion 601, and the stopportion 603 is also located on the flow path 60 b of the vortex.

The stop portion 603 and the discharge portion 602 are also disposed onthe same side of a second plane 502′ that passes through the rotationaxis 504′ and is perpendicular to the first plane 501′. That is to say,the stop portion 603 and the discharge portion 602 are provided at therear of the deck 60.

In a direction perpendicular to the first plane 501′, at least a portionof the stop portion 603 is also located between the discharge portion602 and the hole 6041.

The ratio of the length L1 of the stop portion 603 in the direction ofthe rotation axis 504′ to the depth L2 of the vortex portion 601 in thedirection of the rotation axis 504′ is greater than or equal to 0.1 andless than or equal to 0.5. Therefore, on the one hand, the size of thestop portion 603 is not too large, which hinders effective vortex to begenerated in the vortex portion 601; on the other hand, the size of thestop portion 603 is not too small, which affects the dischargeefficiency of the discharge portion 602 and the grass chopping abilityof the lawn mower 50.

Example 13

FIG. 42 is a lawn mower 10 provided in Example 13 of the presentapplication. Compared with Example 1, the structure of the bladeassembly 101 is the main difference. As shown in FIGS. 42-46, the lawnmower 10 includes a blade assembly 101 for cutting vegetation and a deck102 that houses the blade assembly 101, and the blade assembly 101 islocated inside the deck 102. The lawn mower 10 further includes a motor103 that drives the blade assembly 101 to rotate. The motor 103 islocated above the deck 102. The motor 103 and the blade assembly 101form a coaxial rotation about the rotation axis 10′. The motor 103includes a motor shaft, and the blade assembly 101 includes a driveshaft 1011 (referring to FIG. 44) that drives the blade assembly 101 torotate. The drive shaft 1011 may be a motor shaft. In an example, atransmission mechanism for transmission may also be provided between themotor 103 and the blade assembly 101, so that the shaft of the motor 103and the drive shaft 1011 form a non-coaxial rotation.

As shown in FIGS. 44-46, the blade assembly 101 includes a first blade1012 and a second blade 1013. The first blade 1012 is located above thesecond blade 1013 relative to the ground, and the first blade 1012 andthe second blade 1013 both rotate about a rotation axis 10′. The firstblade 1012 and the second blade 1013 constitute a synchronous rotation.As shown in the direction of the arrow in FIG. 44, the first blade 1012and the second blade 1013 rotate synchronously in the rotation direction10 a′ about the drive shaft 1011. The blade assembly 101 furtherincludes a connecting assembly 1014. The first blade 1012 and the secondblade 1013 form a fixed connection through the connecting assembly 1014.In this example, the first blade 1012 and the second blade 1013 form adetachable connection through the connecting assembly 1014. It isconvenient to repair or replace the blade assembly 101 later. Theconnecting assembly 1014 includes a connecting piece, a nut, and thelike. The connecting assembly 1014 may also connect the first blade 1012and the second blade 1013 with other connection structures. The specificconnection form between the first blade 1012 and the second blade 1013is not limited herein. The blade assembly 101 may also include otheraccessories such as bearings and bearing covers.

Along the rotation direction 10 a′, the first blade 1012 is located infront of the second blade 1013, that is to say, although the first blade1012 and the second blade 1013 rotate synchronously when the motor 103is started, the first blade 1012 cuts the vegetation earlier than thesecond blade 1013. In this example, the rotation direction 10 a′ is aclockwise direction with the drive shaft 1011 as the axis. The firstblade 1012 includes a first mounting portion 1012 a and a first cuttingportion 1012 b. The first mounting portion 1012 a is located in themiddle of the first blade 1012. The first mounting portion 1012 a isconfigured to connect the first blade 1012 and the second blade 1013 andthe drive shaft 1011. The first cutting portion 1012 b is symmetricallydisposed at both ends of the first blade 1012 about the drive shaft1011, and the first cutting portion 1012 b is configured to cutvegetation. Similarly, the second blade 1013 includes a second mountingportion 1013 a located in the middle and second cutting portions 1013 bsymmetrically disposed at both ends. The difference is that the middlepart and the two ends of the first blade 1012 are substantially on thesame plane, that is to say, the first mounting part 1012 a and the firstcutting portion 1012 b are on the same plane, and the entire first blade1012 substantially expands along a plane surface; whereas the middlepart and the two ends of the second blade 1013 are located on differentplanes. The two ends of the second blade 1013 are located below themiddle part of the second blade 1013 with respect to the ground, thatis, the second cutting portion 1013 b is located below the secondmounting portion 1013 a with respect to the ground, and the entiresecond blade 1013 expands along a curved surface. In this example, thefirst mounting portion 1012 a and the second mounting portion 1013 avertically overlap and intersect obliquely, the first mounting portion1012 a and the second mounting portion 1013 a constitute a fixedconnection (referring to FIGS. 45 and 46) through the connecting member1014 a. The connecting member 1014 a is provided with pins of differentshapes, and the first mounting portion 1012 a and the second mountingportion 1013 a are respectively provided with holes for engaging withthe pins, so as to form fixed connections with the connecting member1014 a. In this example, the first mounting portion 1012 a and thesecond mounting portion 1013 a are provided with round holes andirregular-shaped limit holes.

The first cutting portion 1012 b of the first blade 1012 is providedwith a first cutting edge 1012 c for cutting vegetation. The firstcutting edge 1012 c is disposed at the leading edge of the first cuttingportion 1012 b. The leading edge refers to the edge of the first cuttingportion 1012 b that cut vegetation earliest when the first blade 1012rotates along the rotation direction 10 a′. The leading edges of thefirst cutting portions 1012 b at both ends of the first blade 1012 aresymmetrically provided with the first cutting edge 1012 c about thedrive shaft 1011. Similarly, the leading edges of the second cuttingportions 1013 b at both ends of the second blade 1013 are alsosymmetrically provided with a second cutting edge 1013 c.

The first cutting edge 1012 c and the second cutting edge 1013 crespectively include a hardened portion for cutting vegetation. Thehardened portion has a higher hardness than other parts due to ahardening process. In an example, the entire first cutting edge 1012 cand second cutting edge 1013 c are hardened, and the hardness is higherthan other parts of the first blade 1012 and the second blade 1013.

The first blade 1012 further includes a weight reduction portion 1012 d;the weight reduction portion 1012 d is disposed at the end of the firstblade 1012, and behind the first cutting edge 1012 c and in front of thesecond cutting edge 1013 c in the rotation direction 10 a′, that is, theweight reduction portion 1012 d is the portion of the end of the firstblade 1012 opposite the first cutting edge 1012 c. The weight reductionportion 1012 d is disposed symmetrically on both ends of the first blade1012, and the weight reduction portion 1012 d has a recess relative tothe first blade 1012. The weight reduction portion 1012 d reduces theweight of the first blade 1012 and expands the space between the firstblade 1012 and the second cutting edge 1013 c to facilitate secondarycutting of the vegetation cut by the first cutting edge 1012 c. Thefirst blade 1012 further includes a shrinking edge 1012 e inclined orcurved with respect to the trailing edge of the first blade 1012, andthe shrinking edge 1012 e is disposed at the trailing edge of the end ofthe first blade 102. In this example, the shrinking edge 1012 e is partof the edge of the weight reduction portion 1012 d, and the shrinkingedge 1012 e is inclined towards the inside of the first blade 1012 withrespect to the trailing edge of the first blade 1012. Along the rotationdirection 10 a′, the shrinking edge 1012 e is located in front of thesecond cutting edge 1013 c; the projection of the shrinking edge 1012 eon the ground and the projection of the second cutting edge 1013 c onthe ground do not intersect. That is to say, since the shrinking edge1012 e is inclined or curved forward with respect to the trailing edgeof the first blade 1012, the projection of the shrinking edge 1012 e andthe second cutting edge 1013 c has no overlapping portion in a planeparallel to the ground.

As shown in FIG. 46, the shrinking edge 1012 e and the trailing edge ofthe first blade 1012 form a continuous curve with at least one bendingpoint B. The projection of the bending point B on the ground is locatedin front of the projection of the second cutting edge 1013 c on theground in the rotation direction 10 a′. That is to say, the bendingpoint B formed by the shrinking edge 1012 e and the trailing edge of thefirst blade 1012 is located outside the second cutting edge 1013 c in aplane parallel to the second blade 1013, while the lateral distance ofthe projection of the bending point B in the plane of the second blade1013 to the second cutting edge 1013 c is greater than 0. In an example,the shrinking edge 1012 e and the trailing edge of the first blade 1012may form multiple bending points. In this case, the multiple bendingpoints should also meet the above conditions, that is, the projection ofthe bending point on the ground is located in front of the projection ofthe second cutting edge 1013 c on the ground along the rotationdirection 10 a′, and the lateral distance from the bending point to thesecond cutting edge 1013 c is greater than 0.

On the other hand, the length L3 of the shrinking edge 1012 e is greaterthan or equal to 40 mm and less than or equal to 150 mm. In one example,the length L3 of the shrinking edge 1012 e is greater than or equal to70 mm and less than or equal to 100 mm. In this example, the length L3of the shrinking edge 1012 e is about 95 mm.

The projection of the shrinking edge 1012 e on the ground and theprojection of the second cutting edge 1013 c on the ground do notintersect, which makes full use of the length of the second cutting edge1013 c for secondary cutting, while enlarging the space formed by theshrinking edge 1012 e and the second cutting edge 1013 c. Therefore, thevegetation cut by the first cutting edge 1012 c rebounds and falls intothe space to be cut by the second cutting edge 1013 c, thereby improvingthe cutting efficiency of the lawn mower 10.

As the first blade 1012 and the second blade 1013 are arranged tooverlap each other, the extension line of the shrinking edge 1012 e andthe extension line of the second cutting edge 1013 c form an anglewithin a predetermined angle range. In an example, the angle between theextension line of the shrinking edge 1012 e and the extension line ofthe second cutting edge 1013 c is greater than or equal to 15 degreesand less than or equal to 45 degrees. In one example, the angle betweenthe extension line of the shrinking edge 1012 e and the extension lineof the second cutting edge 1013 c is greater than or equal to 25 degreesand less than or equal to 35 degrees. In this example, the angle isapproximately 30 degrees.

The second blade 1013 further includes a tilted portion 1013 d providedat both ends of the second blade 1013, and the tilted portion 1013 dlifts upward and distributes symmetrically on both ends of the secondblade 1013 with respect to the drive shaft 1011. After the air flowgenerated during the rotation of the second blade 1013 is lifted by thetilted portion 1013 d, the grass clippings cut by the second blade 1013can be brought up and thrown up, therefore, the second blade 1013 hasgood performance in throwing the grass clippings.

A noise reduction portion capable of reducing noise is also providednear the tilted portion 1013 d, and the noise reduction portion is anoise reduction groove recessed inward.

Example 14

FIG. 47 and FIG. 48 are schematic diagrams of the lawn mower 30 providedin Example 14 of the present application. In this example, the lawnmower 30 may be a hand-push lawn mower or a riding lawn mower. The lawnmower 30 includes a blade assembly 301, a transmission mechanism, amotor, a housing 302, a handle 303, and wheels 304.

The motor drives the blade assembly 301 to rotate about the rotationaxis 301′ in the cutting direction 30 a′, wherein the cutting direction30 a′ is the clockwise or counter clockwise direction around therotation axis 301′. The transmission mechanism connects the bladeassembly 301 and the motor, and transmits the power of the motor to theblade assembly 301. The housing 302 immobilizes or accommodates themotor. As the main frame structure of the lawn mower, the housing 302assembles multiple parts into a whole. The lawn mower 30 also includes abattery pack that supplies power to the motor. The housing 302 includesa motor housing and a main body housing. The motor housing is configuredto immobilize or accommodate the motor. The motor housing is connectedto the main body housing. A circuit board to control the motor isprovided in the housing 302.

The handle 303 is formed with a grip portion for the user to grip. Thehandle 303 may be formed by the housing 302 or may be attached to thehousing 302 as a separate part. The lawn mower 30 further includes aconnecting rod connecting the handle 303 and the housing 302, and theconnecting rod is telescopic and rotatable relative to the housing 302.The lawn mower 30 further includes a self-propelled motor that drivesthe wheels 304 to rotate. The self-propelled motor and the wheels 304transfer motion with a transmission structure. In an example, theself-propelled motor and the wheels 304 transfer motion with atransmission gear.

As shown in FIGS. 48-50, the blade assembly 301 includes a blade 3011and a rotating shaft 3012. The rotating shaft 3012 has a rotation axis301′ as a central axis, and the blade 3011 is symmetrical about therotation axis 301′; the blade 3011 extends substantially along astraight line perpendicular to the rotation axis 301′; the blade 3011extends substantially along a plane perpendicular to the rotation axis301′. The blade 3011 includes a bottom surface 3011 a and a top surface3011 b. The top surface 3011 b is further away from the ground relativeto the bottom surface 3011 a. In this example, the bottom surface 3011 aand the top surface 3011 b are parallel to each other and are bothperpendicular to the rotation axis 301′. In one example, the bottomsurface 3011 a is a curved surface, and at least a portion of the bottomsurface 3011 a is inclined with respect to the top surface 3011 b; inone example, the top surface 3011 b is a curved surface, and at least aportion of the top surface 3011 b is inclined with respect to the bottomsurface 3011 a.

The blade 3011 further includes a cutting surface 3011 c. The cuttingsurface 3011 c is a plane between the bottom surface 3011 a and the topsurface 3011 b. The plane on which the cutting surface 3011 c is locatedintersects the plane on which the bottom surface 3011 a is located andthe plane on which the top surface 3011 b is located obliquely. That isto say, the cutting surface 3011 c connects the bottom surface 3011 aand the top surface 3011 b and forms a continuous curved surface. Theinclination angle between the cutting surface 3011 c and the bottomsurface 3011 a is greater than or equal to 20 degrees and less than orequal to 35 degrees. In this example, the inclination angle between thecutting surface 3011 c and the bottom surface 3011 a is about 28degrees, and the inclination angle between the cutting surface 3011 cand the top surface 3011 b is about between 30 degrees to 52 degrees.The blade 3011 also includes a cutting portion 3011 d; the cuttingportion 3011 d is located at one end of the blade 3011 and at theleading edge of the blade 3011 along the cutting direction 30 a′. Theleading edge refers to the edge that contacts the vegetation first whenthe blade 3011 rotates along the cutting direction 30 a′, and the edgethat contacts the vegetation after the leading edge is the trailingedge, as shown in FIG. 49. In one example, the blade 3011 includes twocutting portions 3011 d, and the two cutting portions 3011 d arerespectively located at both ends of the blade 3011 and at the leadingedge of the blade 3011 along the cutting direction 30 a′.

The cutting portion 3011 d is defined by the bottom surface 3011 a andthe cutting surface 3011 c; in this example, since the bottom surface3011 a and the cutting surface 3011 c intersect obliquely, the cuttingportion 3011 d is formed by the bottom surface 3011 a and the cuttingsurface 3011 c, and the bottom surface 3011 a and the cutting surface3011 c intersect to form the cutting edge; in one example, the planewhere the cutting surface 3011 c is located obliquely intersects withthe bottom surface 3011 a, but the cutting surface 3011 c does notdirectly intersect with the bottom surface 3011 a; in comparison, thecutting portion 3011 d with the cutting edge is sharper and the cuttingefficiency is also higher.

The cutting portion 3011 d is composed of a body portion 3011 e and ahardened portion 3011 f, wherein the hardened portion 3011 f extendsinward along the end of the blade 3011 and extends from the bottomsurface 3011 a to the top surface 3011 b of the blade 3011. The hardenedportion 3011 f is a hardened layer from laser quenching a part of thecutting portion 3011 d, whereas the body portion 3011 e is not laserquenched, therefore, the surface hardness of the hardened portion 3011 fis greater than the surface hardness of the body portion 3011 e. In oneexample, the ratio of the surface hardness of the hardened portion 3011f of the blade 3011 to the surface hardness of the body portion 3011 eis greater than 1.1 and less than or equal to 2.4. In one example, theratio of the surface hardness of the hardened portion 3011 f to thesurface hardness of the body portion 3011 e is greater than 1.2 and lessthan or equal to 2. The surface hardness distribution of the hardenedportion 3011 f and the body portion 3011 e makes the structure of theblade 3011 more reasonable. The hardened portion 3011 f is a cuttingportion 3011 d near the bottom and end of the blade 3011, which is ahigh-frequency region for cutting vegetation. Accordingly, the hardenedportion 3011 f with a higher surface hardness can improve the wearresistance and cutting efficiency of the blade 3011, and also improvethe reliability and service life of the blade 3011 of the lawn mower 30.

The method of manufacturing the blade 3011 includes: laser cutting andforming, laser cutting the metal sheet to obtain the blade 3011 in anunsharpened state; laser quenching, laser hardening the area where thehardened portion 3011 f is located to improve the surface hardness ofthe area; processing the cutting portion 3011 d, processing the blade3011 in the unsharpened state to create the cutting portion 3011 d; andpolishing the blade 3011, polishing the blade 3011 to remove burrsgenerated during the processing of the blade 3011.

The area where the hardened portion 3011 f is located is shown in FIGS.49 and 50. In an example, the hardened portion 3011 f has a trapezoidalcross section and a rectangular vertical section. The length L of thehardened portion 3011 f is greater than or equal to 50 mm and less thanor equal to 120 mm; the lateral width W of the hardened portion 3011 fis greater than or equal to 2 mm and less than or equal to 8 mm; thedepth H of the hardened portion 3011 f is greater than 0.2 mm and lessthan or equal to 1 mm. In an example, the depth H of the hardenedportion 3011 f is greater than 0.3 mm and less than or equal to 0.6 mm.In this example, the length L of the hardened portion 3011 f isapproximately 100 mm; the lateral width W of the hardened portion 3011 fis approximately 5 mm, which is approximately equal to the lateral widthof the cutting portion 3011 d; the depth H of the hardened portion 3011f is approximately 0.5 mm. The depth H of the hardened portion 3011 frefers to the depth of the hardened layer obtained by laser quenchingthe blade 3011. The above-mentioned size setting of the hardened portion3011 f of the blade 3011 can save the manufacturing cost while ensuringthe cutting strength. In addition, considering the different degrees ofwear of the hardened portion 3011 f and the body portion 3011 e, theabove size design makes the cutting portion 3011 d maintain a sharpstate for a long time after wear.

Further, the ratio of the surface hardness of the hardened portion 3011f to the depth of the hardened portion 3011 f is greater than or equalto 1000 HV1/mm and less than or equal to 2000 HV1/mm. In one example,the ratio of the surface hardness of the hardened portion 3011 f to thedepth of the hardened portion 3011 f is greater than or equal to 1100HV1/mm and less than or equal to 1500 HV1/mm. In an example, the surfacehardness of the body portion 3011 e is greater than or equal to 350 HV1and less than or equal to 500 HV1, and the surface hardness of thehardened portion 3011 f is greater than or equal to 550 HV1 and lessthan or equal to 750 HV1; in one example, the surface hardness of thebody portion 3011 e is greater than or equal to 380 HV1 and less than orequal to 440 HV1, and the surface hardness of the hardened portion 3011f is greater than or equal to 600 HV1 and less than or equal to 700 HV.

The blade assembly 301 further includes a bearing, and a connector or afastener, etc. configured to fix and connect the blade 3011.

Example 15

FIG. 51 and FIG. 52 respectively show a schematic diagram of a bladeassembly 401 and a blade of a lawn mower provided in Example 15 of thepresent application. The present example differs from Example 14 inthat: the blade assembly 401 comprises a shaft 4011, a first blade 4012and a second blade 4013; the first blade 4012 and the second blade 4013are stacked up and down together to synchronously rotate about therotation axis 401′; in an example, the first blade 4012 and the secondblade 4013 are stacked up and down together to asynchronously rotateabout the rotation axis 401′; in one example, the first blade 4012 andthe second blade 4013 rotate about the first axis and the second axisrespectively, and the first axis and the second axis are in parallel butdo not coincide.

The first blade 4012 includes a first cutting portion 4012 d, and thesecond blade 4013 includes a second cutting portion 4013 d. Structuralfeatures such as the hardened portion and the body portion in Example 14are applicable to the first blade 4012 and the second blade 4013 in thisexample.

What is claimed is:
 1. A lawn mower comprising: a blade assemblyconfigured to perform a cutting function; a deck formed with anaccommodation space for accommodating at least a portion of the bladeassembly; a motor comprising a drive shaft configured to drive the bladeassembly to rotate about a rotation axis; a battery pack configured toprovide a power source for the motor; and a mounting assembly configuredto mount the blade assembly to the drive shaft, wherein the bladeassembly comprises: a first blade comprising a first cutting portionconfigured to cut grass; and a second blade comprising a second cuttingportion configured to cut grass; wherein in a direction parallel to therotation axis, the second cutting portion is located below the firstcutting portion; wherein the battery pack comprises: a battery packhousing; and battery cells provided in the battery pack housing; whereina diameter of a smallest cylinder surrounding the blade assembly isdefined as a rotation diameter of the blade assembly, and the firstcutting portion and the second cutting portion are both located in aspace surrounded by the smallest cylinder; wherein a product of arotation diameter D (mm), a number N of the battery cells in the batterypack, and a mass M (g) of the blade assembly is greater than or equal to3.5×10⁵ (mm·g) and less than or equal to 7.3×10⁷ (mm·g), and wherein themounting assembly comprises a drive member mounted to the drive shaftand a clamping assembly configured to clamp the blade assembly to thedrive member, the drive member is a fan mounted to the drive shaft, thefan is provided with a drive portion configured to mount and positionthe blade assembly, and the drive portion is configured to connect thefirst blade and the second blade to fix the first blade in acircumferential direction of the rotation axis relative to the secondblade.
 2. The lawn mower of claim 1, wherein the product of the rotationdiameter D (mm), the number N of the battery cells in the battery pack,and the mass M (g) of the blade assembly is greater than or equal to7×10⁵ (mm·g) and less than or equal to 3.6×10⁷ (mm·g).
 3. The lawn mowerof claim 2, wherein the product of the rotation diameter D (mm), thenumber N of the battery cells in the battery pack, and the mass M (g) ofthe blade assembly is greater than or equal to 1.4×10⁶ (mm·g) and lessthan or equal to 1.8×10⁷ (mm·g).
 4. The lawn mower of claim 1, whereinthe first blade and the second blade are formed integrally orseparately.
 5. The lawn mower of claim 1, wherein an output torque ofthe motor is greater than or equal to 0 N·m and less than or equal to 10N·m.
 6. The lawn mower of claim 1, wherein an output torque of the motoris greater than or equal to 3 N·m and less than or equal to 8 N·m. 7.The lawn mower of claim 1, wherein the deck is provided with a dischargechute to expel grass clippings and, when a linear velocity of a tip ofthe blade assembly is greater than or equal to 40 m/s and less than orequal to 100 m/s, an average air velocity at the discharge chute isgreater than or equal to 3 m/s and less than or equal to 25 m/s.
 8. Thelawn mower of claim 1, further comprises a control system configured tocontrol an operation of the motor and wherein, when the lawn mower hasno load, a sum of an input power of the motor, an input power of thecontrol system, and an input power of the blade assembly is a no-loadinput power of the lawn mower and the no-load input power is greaterthan or equal to 100 W and less than or equal to 380 W.
 9. The lawnmower of claim 1, wherein a rotational inertia of the blade assembly isgreater than or equal to 8000 kg·mm² and less than or equal to 23000kg·mm².
 10. The lawn mower of claim 1, wherein a phase angle formed bythe first cutting portion and the second cutting portion is greater thanor equal to 0 degrees and less than 90 degrees.
 11. The lawn mower ofclaim 1, wherein the rotation diameter D is greater than or equal to 200mm and less than or equal to 700 mm.
 12. The lawn mower of claim 1,wherein the mass of the blade assembly is greater than or equal to 0.35kg and less than or equal to 1.8 kg.
 13. The lawn mower of claim 1,wherein a length of a projection of the first cutting portion in a planeperpendicular to the rotation axis is greater than or equal to 10 mm andless than or equal to 600 mm and the length of the projection of thesecond cutting portion in a plane perpendicular to the rotation axis isgreater than or equal to 10 mm and less than or equal to 600 mm.
 14. Thelawn mower of claim 1, wherein, when the motor drives the blade assemblyto rotate around the rotation axis with no load, a working time of thelawn mower with 100 WH energy consumption of the battery pack is definedas a no-load battery life of the lawn mower and the no-load battery lifeof the lawn mower is greater than or equal to 9 min and less than orequal to 35 min.
 15. The lawn mower of claim 14, wherein the no-loadbattery life of the lawn mower is greater than or equal to 12 min andless than or equal to 33 min.
 16. The lawn mower of claim 15, whereinthe no-load battery life of the lawn mower is greater than or equal to18 min and less than or equal to 30 min.
 17. The lawn mower of claim 1,wherein the first cutting portion extends substantially in a firststraight direction and the second cutting portion extends substantiallyin a first curved direction.